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BTUs in GDP 以本地生产总值计算的热单位
Pub Date : 1900-01-01 DOI: 10.20955/es.2002.12
Michael R. Pakko
T his spring, the U.S. Congress returned to a topic that has become a staple of political discussion in Washington: the role of energy in the economy and, in particular, the dependence of the U.S. economy on energy imports. Since 1973, when President Richard Nixon announced the goal of making the United States energy-independent by the end of that decade, the nation has steadily increased its energy imports. This trend is usually expressed in terms of petroleum imports. According to statistics from the U.S. Department of Energy, the United States imported about one-quarter of all the petroleum it used in the early 1970s. By 2000, that fraction had risen to nearly 57 percent. When all sources of energy are considered, not just those from petroleum products, import shares have not been as large. As measured by total British thermal units (BTUs) generated from all sources, the U.S. reliance on imported energy rose from about 10 percent of total energy used in the early 1970s to nearly 25 percent in 2000. Over the same period, however, the United States has become much more efficient in its use of energy resources, mitigating the overall dependence of the economy on foreign energy supplies. Economic theory suggests that when a factor of production such as energy is subject to supply uncertainties and price spikes—like we have seen since the 1970s—the users of that factor have incentives to economize by substituting other factors and switching toward production techniques that do not depend so heavily on that factor. As illustrated in the accompanying chart, the U.S. economy has, indeed, become much more efficient in its use of energy over past decades, particularly since the early 1970s. In terms of energy consumption per unit of real economic output, efficiency has nearly doubled. Between 1970 and 2000, the energy needed to produce one dollar of real gross domestic product (GDP) declined from nearly 19 thousand BTUs to 10.6 thousand BTUs. Were it not for this improvement in energy efficiency, the U.S. might very well be even more dependent on imported energy than it is today. The chart also shows that, as the U.S. economy has grown and diversified, domestic energy production has also declined relative to total output. With energy production and consumption both falling relative to GDP, the gap between the two—net energy imports relative to GDP— has changed little since the 1970s: In 1973, energy imports amounted to 3.0 thousand BTUs per dollar of real GDP produced. In 2000, that measure of energy dependence stood at 2.9 thousand BTUs. When measured relative to total economic activity, therefore, these statistics show that the economic significance of energy imports has not changed substantially over the past quarter-century. BTUs in GDP
今年春天,美国国会回到了一个已经成为华盛顿政治讨论的主要话题:能源在经济中的作用,特别是美国经济对能源进口的依赖。自1973年理查德·尼克松(Richard Nixon)总统宣布在那个十年结束前使美国实现能源独立的目标以来,美国的能源进口一直在稳步增加。这种趋势通常用石油进口来表示。根据美国能源部的统计数据,20世纪70年代初,美国大约四分之一的石油消耗来自进口。到2000年,这一比例上升到近57%。如果考虑到所有能源来源,而不仅仅是石油产品,进口所占的份额就没有那么大了。以所有来源产生的总英国热量单位(btu)来衡量,美国对进口能源的依赖从20世纪70年代初占总能源消耗的10%左右上升到2000年的近25%。然而,在同一时期,美国在利用能源方面的效率大大提高,减轻了美国经济对外国能源供应的总体依赖。经济理论表明,当一种生产要素,如能源,受制于供应的不确定性和价格的飙升——就像我们自20世纪70年代以来所看到的那样——该要素的使用者有动机通过替代其他要素和转向不那么依赖于该要素的生产技术来节约成本。正如所附图表所示,美国经济在过去几十年里,特别是自20世纪70年代初以来,确实在能源利用方面变得更有效率了。就单位实际经济产出的能源消耗而言,效率几乎翻了一番。1970年至2000年间,生产1美元实际国内生产总值(GDP)所需的能源从近1.9万btu下降到10.6万btu。如果不是能源效率的提高,美国很可能会比现在更加依赖进口能源。图表还显示,随着美国经济的增长和多元化,国内能源产量相对于总产出也有所下降。由于能源生产和消费相对于GDP都在下降,两者之间的差距——净能源进口相对于GDP——自20世纪70年代以来几乎没有变化:1973年,每美元实际GDP的能源进口为3万btu。2000年,这一能源依赖指标为2.9万btu。因此,当相对于总体经济活动进行衡量时,这些统计数据表明,能源进口的经济意义在过去的四分之一世纪中没有发生实质性变化。以本地生产总值计算的热单位
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引用次数: 0
Energy prices: In the mix or swept under the rug? 能源价格:在混合中还是被掩盖?
Pub Date : 1900-01-01 DOI: 10.20955/es.2007.9
James Bullard, Geetanjali Pande
Views expressed do not necessarily reflect official positions of the Federal Reserve System. The Federal Open Market Committee (FOMC) has responsibility for the long-run inflation rate for the U.S. economy and therefore needs a reliable indicator of trend movements of inflation. Currently, the Committee focuses on the personal consumption expenditures (PCE) inflation rate—in particular, on the core rate. The core rate excludes food and energy, two components that, since 2000, together account for approximately 18 percent of the index, about 13 percent food and 5 percent energy. Policymakers generally consider the energy component, in particular, to be too volatile to inform their month-to-month deliberations. But is it a good idea to exclude prices that are, after all, faced by consumers, when trying to read movements in trend inflation? A trend inflation indicator that is often used is PCE inflation measured from one year earlier. The chart shows inflation rate data since 2000. Pictured are the inflation rates for the PCE, the core PCE, and the energy component of the PCE. The chart indicates that the energy component is quite volatile, as expected. If the core PCE concept is valid, the energy component should be sometimes above and sometimes below the PCE inflation rate, as it was in 2001 and 2002. In this situation, the core concept removes a volatile component and gives the Committee a better indicator of trend inflation movements. However, the data since 2003 show a persistent divergence in the overall and core PCE inflation rates, as the inflation in the energy component has remained high. For this time period, excluding energy prices simply amounts to putting zero weight on the prices that are increasing at the most rapid rate. Accordingly, the chart indicates that the core PCE inflation rate has averaged about 1.94 percent per year, while the PCE has averaged 2.56 percent during this period. One could interpret this as a sustained understatement of the true trend inflation rate, rendering the core measure a misleading trend inflation indicator for policymakers. The problem is this: Instead of simply being volatile, energy prices moved to a higher level and have remained at the higher level. That means that the relative price of energy has increased more or less continuously for the past several years. Given our relatively inelastic demand for energy, at least in the short run, all of us consumers were forced to spend more on energy and less on all other goods. From this source we expect downward pressure on the prices of all non-energy goods and services. Once the relative price change is complete, we would expect energy prices to be volatile around their new, higher level, but again grow at the same rate on average as the prices of all other goods. As the chart indicates, during the transition toward a higher relative price of energy there was a sustained gap between the overall and core PCE inflation rates. We conclude that excluding en
本文所表达的观点不一定反映联邦储备系统的官方立场。联邦公开市场委员会(FOMC)对美国经济的长期通胀率负有责任,因此需要一个可靠的通胀趋势指标。目前,委员会关注的是个人消费支出(PCE)通胀率,特别是核心通胀率。核心价格指数不包括食品和能源,自2000年以来,这两个组成部分合计约占该指数的18%,其中食品约占13%,能源约占5%。政策制定者通常认为,特别是能源部分,太不稳定,无法为他们每月的审议提供信息。但是,在试图解读趋势通胀走势时,排除消费者毕竟要面对的价格是个好主意吗?经常使用的趋势通胀指标是一年前衡量的个人消费支出通胀。图表显示了2000年以来的通货膨胀率数据。图示为个人消费支出、核心个人消费支出和个人消费支出的能源部分的通货膨胀率。图表显示,能源部分如预期的那样波动很大。如果核心个人消费支出概念是有效的,那么能源成分应该时而高于时而低于个人消费支出通胀率,就像2001年和2002年那样。在这种情况下,核心概念消除了一个不稳定的组成部分,使委员会能够更好地反映通货膨胀趋势。然而,自2003年以来的数据显示,由于能源部分的通胀仍然很高,整体和核心个人消费支出通胀率持续存在分歧。在这段时间内,不包括能源价格就等于不考虑以最快速度增长的价格。因此,图表显示,核心个人消费支出通胀率平均每年约为1.94%,而个人消费支出在此期间平均为2.56%。人们可以将其解释为对真实趋势通胀率的持续低估,使核心指标成为政策制定者误导性的趋势通胀指标。问题在于:能源价格并不是简单地波动,而是走向了更高的水平,并一直保持在更高的水平。这意味着能源的相对价格在过去几年中或多或少地持续上涨。考虑到我们对能源的需求相对缺乏弹性,至少在短期内,我们所有的消费者都被迫在能源上花更多的钱,在其他所有商品上花更少的钱。从这个角度来看,我们预计所有非能源商品和服务的价格都将面临下行压力。一旦相对价格变化完成,我们预计能源价格将在新的更高水平附近波动,但会再次以与所有其他商品价格相同的平均速度增长。如图所示,在向更高的能源相对价格过渡期间,整体和核心个人消费支出通胀率之间存在持续的差距。我们的结论是,在相对价格变化期间,排除能源价格可能不是一个好主意。
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引用次数: 0
Putting off retirement: the rise of the 401(k) 推迟退休:401(k)计划的增加
Pub Date : 1900-01-01 DOI: 10.20955/ES.2002.7
Abbigail J. Chiodo, Michael T. Owyang
I n the last 20 years, one notable trend in pension structure is that defined benefit (DB) pensions (i.e., plans that offer a predetermined payoff after a certain number of years of employment) have become less common while defined contribution (DC) plans (e.g., 401(k) plans) have become much more common.1 Economic theory suggests that one reason companies offer DB pensions is to induce workers to retire at a specific age. Does the rise of the 401(k) plan change the retirement incentives of workers? A standard DB plan is set up to spike in value at a predetermined age. A worker with a DB plan, therefore, has the incentive to stay at his or her job at least until the value of the pension is at its highest. For example, the payoff from a DB pension may leap from 20 percent to 40 percent of pre-retirement income when the worker turns 60. Continuing to work past age 60 leads to little or no additional increases in future benefits, thus giving the worker the incentive to retire at age 60. A DC plan differs from a DB plan in two important ways: the annuity value of a DC plan does not hit a peak at any certain age and a DC plan is portable between jobs. A worker with a DC plan, then, can change jobs at any age without jeopardizing retirement income. With DC plans, workers retire when the combination of retirement annuity income is sufficiently high and work satisfaction is sufficiently low. The portability of DC plans across employers and the absence of an upper bound on their annuity value should imply later retirement dates, on aver age. But do employees with 401(k)’s really work longer? Using data from the Health and Retirement Study, Leora Friedberg and Tony Webb (2000) estimate the likelihood, from one year to the next, that a full-time employee will voluntarily leave his or her job and fully retire.2 The accompanying Figure shows predicted labor participation of workers with a DB plan. More than 80 percent would retire by age 65. If those same workers had a DC pension, only about 60 percent would retire by age 65. Controlling for earnings, wealth, and Social Security, Friedberg and Webb find that workers with DC pensions are less likely to retire in any given year than workers with DB plans. Overall, they estimate that a worker with a DB plan retires 23 months earlier on average, other things equal. They also predict that the change in pension structure to date will raise the average retirement age of pensioned workers between three and eight months. Changes in the workplace have afforded workers more flexibility and more mobility. Pension coverage has followed this trend with portable 401(k) plans replacing defined benefit pensions, thereby allowing individuals to choose their own retirement age based on their personal preferences concerning work satisfaction and desired retirement income.
在过去的20年里,养老金结构的一个显著趋势是,固定收益(DB)养老金(即,在工作一定年限后提供预定收益的计划)变得越来越不常见,而固定缴款(DC)计划(如401(k)计划)变得越来越普遍经济理论认为,公司提供固定退休金的一个原因是为了诱使员工在特定年龄退休。401(k)计划的增加会改变工人的退休激励吗?标准的DB计划设定在预定年龄时价值飙升。因此,拥有固定收益计划的工人有动力留在他或她的工作岗位上,至少直到养老金的价值达到最高。例如,当工人年满60岁时,DB养老金的支付可能会从退休前收入的20%跃升至40%。60岁以后继续工作,未来的福利很少或没有额外的增加,因此给了工人在60岁退休的动力。固定缴款计划与固定缴款计划在两个重要方面有所不同:固定缴款计划的年金价值不会在任何特定年龄达到峰值,而且固定缴款计划可以在不同工作之间转移。因此,拥有固定缴款计划的员工可以在任何年龄更换工作,而不会影响退休收入。在固定缴款计划中,员工在退休年金收入足够高而工作满意度足够低的情况下退休。固定缴款计划在雇主之间的可移植性,以及他们的年金价值没有上限,应该意味着平均退休日期的推迟。但拥有401(k)计划的员工真的能工作更长时间吗?利用健康与退休研究的数据,Leora Friedberg和Tony Webb(2000)估计了全职员工自愿离职并完全退休的可能性附图显示了参加固定工资计划的工人的预期劳动参与率。超过80%的人会在65岁退休。如果这些工人有固定缴款养老金,只有大约60%的人会在65岁前退休。在控制了收入、财富和社会保障因素后,弗里德伯格和韦伯发现,享有固定缴款养老金的员工在任何一年都比享有固定缴款养老金的员工更不可能退休。总体而言,他们估计,在其他条件相同的情况下,拥有固定收益计划的员工平均提前23个月退休。他们还预测,到目前为止,养老金结构的变化将使领取养老金的工人的平均退休年龄提高3到8个月。工作场所的变化为员工提供了更大的灵活性和流动性。养老金覆盖也顺应了这一趋势,便携式401(k)计划取代了固定收益养老金,从而允许个人根据个人对工作满意度和期望退休收入的偏好选择自己的退休年龄。
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引用次数: 0
U.S. production abroad 美国在海外的生产
Pub Date : 1900-01-01 DOI: 10.20955/ES.2004.14
P. Pollard
U .S. multinational corporations have expanded their overseas operations substantially during the past 15 years. In 2002 (the latest year for which data are available) the foreign affiliates in which U.S. non bank corporations held majority ownership employed 8.2 million workers, a 77 percent increase since 1987. What explains this increase? One view is that corporations are increasingly shifting production to low-wage countries. U.S. corporations have increased their presence dramatically in some low-wage countries between 1987 and 2001 (the latest year for which data on a country basis are available). Employment by U.S. affiliates in Mexico tripled during this 14-year period, from 264,000 workers to 802,000. U.S. firms employ more workers in Mexico than in any foreign country, other than the United Kingdom and Canada. Employment by U.S. affiliates in China also has expanded rapidly. In 1987, employment in China by U.S. affiliates was negligible. In 2001 it ranked as one of the top ten countries for U.S. affiliates, with 273,000 workers employed by U.S. firms. Nevertheless, the data suggest that low wages are not the driving force behind much international investment. Most workers employed by foreign affiliates of U.S. corporations are located in other high-wage countries, even though the share of overseas employment by U.S. corporations in highwage countries declined between 1987 and 2001. In 1987, 68.3 percent of workers employed by foreign affiliates of U.S. corporations were located in high-wage countries; in 2001, this share fell to 61.4 percent.1 Although much attention has focused on the increase in foreign employment by U.S. firms, there has been a similar increase in the number of workers in the United States employed by foreign-owned corporations. The U.S.-based affiliates of foreign firms employed 5.4 million workers in the United States in 2002, more than double the number of workers in 1987. Foreign firms employ workers in all 50 states, accounting for 5 percent of U.S. private industry jobs. The decision of foreign corporations to establish or expand operations in the United States is clearly not driven by low wages. Indeed, if wages were the key factor in a firm’s decision to invest abroad then one would expect that most firms would locate in the lowest-wage countries, yet these countries see little foreign investment. In fact, the 49 countries designated by the United Nations as the least developed (with an annual per capita GDP under $900) account for less than 1 percent of the foreign employment of U.S. foreign corporations. One factor overlooked by the emphasis on wages is productivity. The labor cost of production depends not solely on the hourly wage a worker earns but also on how much the worker produces each hour. The productivity of workers in low-wage countries is typically lower than in high-wage countries. Other factors that are important determinants of foreign investment are the political stability of a country, the
了邮。在过去的15年中,跨国公司大大扩展了他们的海外业务。2002年(可获得数据的最近一年),美国非银行公司持有多数股权的外国子公司雇佣了820万工人,比1987年增加了77%。如何解释这种增长?一种观点认为,企业正越来越多地将生产转移到低工资国家。美国公司在1987年至2001年间(这是可获得的以国家为基础的数据的最近一年)在一些低工资国家大幅增加了业务。在这14年间,美国在墨西哥分支机构的就业人数增加了两倍,从26.4万人增加到80.2万人。美国公司在墨西哥雇佣的工人比除英国和加拿大以外的任何国家都多。美国在华分支机构的就业人数也迅速增加。1987年,美国子公司在中国的就业几乎可以忽略不计。2001年,它被美国公司列为美国子公司最多的十个国家之一,美国公司雇用了27.3万名工人。然而,数据表明,低工资并不是很多国际投资背后的推动力。尽管美国公司在高工资国家的海外就业份额在1987年至2001年间有所下降,但美国公司的海外分支机构雇用的大多数工人都位于其他高工资国家。1987年,美国公司海外分支机构雇用的工人中有68.3%位于高工资国家;2001年,这一比例降至61.4%虽然许多注意力都集中在美国公司雇用外国员工的增加上,但外国公司在美国雇用的工人人数也有类似的增加。2002年,外国公司在美国的分支机构雇用了540万名工人,是1987年的两倍多。外国公司在全美50个州雇佣工人,占美国私营企业就业岗位的5%。外国公司决定在美国建立或扩大业务显然不是由低工资驱动的。事实上,如果工资是企业决定在国外投资的关键因素,那么人们可以预期,大多数企业将设在工资最低的国家,但这些国家几乎没有外国投资。事实上,被联合国指定为最不发达国家(年人均国内生产总值低于900美元)的49个国家在美国外国公司的外国就业人数中所占比例不到1%。强调工资而忽视的一个因素是生产率。生产的劳动力成本不仅取决于工人的小时工资,还取决于工人每小时生产多少产品。低工资国家工人的生产率通常低于高工资国家。外国投资的其他重要决定因素是一个国家的政治稳定、基础设施和整体商业环境。另一个促使公司决定建立海外子公司的因素是进入当地市场。衡量市场准入重要性的一种方法是看看外国子公司的销售目的地。美国公司的海外分公司65%的销售额流向了当地市场。另外24%的销售额被运往其他国家,主要是在当地。只有11%的销售额是出口到美国市场的。虽然在低工资国家为美国生产的产品比例通常高于11%的平均水平,但即使在这些国家,大部分产品也是为当地市场生产的。例如,2001年,美国在墨西哥的子公司有28%的销售额出口到美国,而64%的销售额进入当地市场。在中国,美国子公司生产的产品有71%销往当地市场。这表明,对一些公司来说,在中国投资的吸引力不是获得廉价劳动力,而是获得10亿消费者。
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引用次数: 1
Social security, saving, and wealth accumulation 社会保障、储蓄和财富积累
Pub Date : 1900-01-01 DOI: 10.20955/ES.2005.12
D. Thornton
Social Security is a publicly run, mandatory retirement program. A number of analysts have suggested that the program be privatized. I discuss here the difference between the current Social Security program and an effectively equivalent private program with respect to wealth accumulation and saving at the individual and national levels. Under current law, Social Security requires each covered worker to pay into the program 12.4 percent of their taxable income (6.2 percent each from employee and employer). In return, those covered by Social Security receive payments that are determined by several factors, including age at retirement and the amount of payroll tax contributions made while working. In an essentially equivalent private program, the government could require each covered worker (and/or the employer) to pay into a private investment account 12.4 percent of their taxable income and prevent workers from accessing these accounts until they retired. In the private program, however, workers would own their accumulated contributions and earnings. That is, workers would accumulate wealth. Individuals would thereby have considerable flexibility. They could be given some discretion on how the funds are invested. Moreover, unlike the one-size-fits-all approach of Social Security, individuals could be given considerable discretion as to how the funds would be disbursed upon retirement. Those who were interested in providing their children with opportunities they never had might decide to work longer and pass all or most of their wealth to their heirs. Alternatively, individuals with relatively short life expectancies might opt to retire at the earliest possible date and/or disburse funds more quickly. In the event of an untimely death, the wealth accumulated in their account could be passed to their heirs or given to philanthropic causes. This flexibility could be particularly important to lowand moderateincome earners who may find it difficult to save beyond what they are required to contribute to Social Security. Private accounts would give these earners a greater opportunity to accumulate wealth that they could use at their discretion, which would provide them opportunities not available under the obligatory Social Security annuity. Economists have long known that current consumption and investment—at both the individual and national levels—do not depend so much on current income as on permanent income, which is to say, wealth. It is difficult to estimate how much private wealth accumulation would have differed had Social Security been administered privately rather than publicly. How ever, the Social Security trust fund balance—the accumulated Social Security tax receipts less Social Security payments plus earnings—at the end of 2004 was $1.68 trillion, about two-fifths as large as the federal debt held by the public. Whereas private savings are channeled through financial markets and ultimately lent to individuals, businesses, and governments—s
社会保障是一项公共管理的强制性退休计划。一些分析人士建议将该项目私有化。我在这里讨论当前的社会保障计划与个人和国家层面的财富积累和储蓄方面有效等效的私人计划之间的区别。根据现行法律,社会保障要求每个参保工人缴纳其应税收入的12.4%(雇员和雇主各缴纳6.2%)。作为回报,那些受社会保障保障的人收到的款项由几个因素决定,包括退休年龄和工作时缴纳的工资税金额。在一个本质上相当的私人计划中,政府可以要求每个受保工人(和/或雇主)将其应税收入的12.4%存入私人投资账户,并禁止工人在退休前使用这些账户。然而,在私人计划中,工人将拥有他们累积的捐款和收入。也就是说,工人会积累财富。因此,个人将有相当大的灵活性。他们可以在如何投资这些资金方面获得一定的自由裁量权。此外,与社会保障的一刀切方法不同,个人在退休后如何支付这些资金方面可以有相当大的自由裁量权。那些有兴趣为子女提供他们从未有过的机会的人可能会决定工作更长时间,并将全部或大部分财富传给他们的继承人。另外,预期寿命相对较短的个人可能会选择尽早退休,并/或更快地支付资金。如果某人英年早逝,他们账户中积累的财富可以传给继承人或用于慈善事业。对于低收入和中等收入者来说,这种灵活性尤其重要,因为他们可能会发现很难存下超过缴纳社会保障所需金额的钱。私人账户将为这些收入者提供更大的机会来积累财富,他们可以自由支配,这将为他们提供强制性社会保障年金所没有的机会。经济学家们早就知道,当前的消费和投资——无论是个人还是国家层面——与其说是依赖于当前收入,不如说是依赖于永久性收入,也就是财富。很难估计,如果社会保障由私人管理而不是由公共管理,私人财富积累会有多大不同。然而,社会保障信托基金的余额——累计的社会保障税收收入减去社会保障支付加上收入——在2004年底是1.68万亿美元,大约是公众持有的联邦债务的五分之二。目前,私人储蓄通过金融市场引导,最终贷给个人、企业和政府(州、地方和联邦),而社会保障信托基金并没有通过竞争性金融市场进行分配,也没有获得由市场决定的回报率。因此,与私人储蓄不同,社会保障税不能直接用于资助私人支出和投资。今年的社会保障税收入用于支付今年的社会保障金。在税收收入大于支付福利的年份,社会保障就会出现盈余。如果盈余被用来减少国家债务,可用于私人消费或投资的资金将基本上与私人制度下相同。然而,事实并非如此。自20世纪80年代初以来,社会保障一直处于盈余状态。社会保障盈余非但没有减少国家债务,从而增加可用于私人支出的资金池,反而经常被用于资助“预算内”赤字支出。这种做法的效果是,统一的预算赤字比社会保障由私人运营的情况下要小。美联储主席格林斯潘最近在向国会报告时指出,“个人或私人账户的主要吸引力在于,它们可以被构建为真正与统一预算分开,因此,更有可能促使联邦政府采取那些将减少公众储蓄和提高国民储蓄的行动。”政府不可能简单地用社会保障盈余来弥补预算赤字。相反,它将不得不在金融市场上与私人投资者争夺私人储蓄。培育私人财富积累和增加资金流入竞争性金融市场,会在多大程度上促进经济增长或减少政府借贷(和支出)的动机,这很难说。 然而,很明显,目前的制度将资金从竞争激烈的金融市场转移,并削弱了中低收入者对其退休基金的控制权。2005年3月15日,美国参议院老龄问题特别委员会,主席艾伦·格林斯潘关于社会保障计划的未来和退休经济的证词。社会保障、储蓄和财富积累
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引用次数: 0
The seasonal cycle and the business cycle 季节性周期和商业周期
Pub Date : 1900-01-01 DOI: 10.20955/ES.2006.17
Y. Wen
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引用次数: 3
Volatile firms, stable economy 不稳定的公司,稳定的经济
Pub Date : 1900-01-01 DOI: 10.20955/ES.2004.7
Hui Guo
Idiosyncratic stock volatility refers to the variation in returns to an individual company’s stock that is not explained by the overall market return. Given returns in a quarter, for example, we can run a regression of one company’s daily returns on daily market returns and use the standard deviation of the residuals as a measure of the idiosyncratic volatility of that company’s stock in that quarter. To obtain an aggregate measure, we calculate the idiosyncratic volatility for each of 500 stocks with the largest market capitalization using the CRSP (Center for Research of Security Prices) daily returns data and then calculate an average weighted by market value. In the accompanying chart, we plot this aggregate measure of idiosyncratic volatility for the period 1963:Q3 to 2002:Q4, with the shaded areas indicating business recessions dated by the National Bureau of Economic Research. We observe some interesting patterns. First, idiosyncratic volatility exhibits some persistence: If it is high, it is likely to remain at a relatively high level for a while. Second, idiosyncratic volatility fluctuates widely across time and it tends to rise especially during business recessions. It also has a dramatic upward spike during the stock market bubble in the late 1990s. Third, and most interestingly, as noted by many financial market observers, idiosyncratic volatility has increased on average in the past four decades: A linear time trend accounts for about 24 percent of its total variation. According to standard finance theory, a firm’s stock price is equal to its discounted expected future cash flows. Therefore, rising idiosyncratic volatility might reflect the fact that the firm-level economic performance has become more volatile. To investigate this hypothesis, some researchers have looked at firm-level variability in sales and earnings growth and have found upward trends in these measures as well. The increase in firm-level variability is in sharp contrast with the well-documented decline in the variability of the aggregate U.S. economy. Some tentative explanations have been put forward to reconcile the diverging trends in macroeconomic and firm-level volatilities. For example, Philippon (2003) suggests that the two phenomena can be explained simultaneously by the fact that goods markets have become more competitive.1 Compe ti tion between firms magnifies the effects of idiosyncratic productivity shocks, which helps explain the rise in firm volatility. At the same time, competitive pressures could induce firms to increase the frequency of their price adjustment, making the overall economy more resilient to aggregate demand shocks. The increased firm-level volatility has important implications for the U.S. economy. For example, with a higher degree of idiosyncratic volatility, a typical firm is presumably more vulnerable to bankruptcy risk and thus needs to pay a higher default premium to raise capital in the bond market. Indeed, Campbell and Taksler (
股票的特殊波动率是指个别公司股票的收益变化不能用整体市场收益来解释。例如,给定一个季度的回报,我们可以对一家公司的每日市场回报进行回归,并使用残差的标准差来衡量该公司股票在该季度的特殊波动性。为了获得一个总体度量,我们使用CRSP(证券价格研究中心)每日回报数据计算500只市值最大的股票的特质波动率,然后计算市值加权的平均值。在随附的图表中,我们绘制了1963年第三季度至2002年第四季度的特殊波动率的汇总指标,阴影区域表示国家经济研究局(National Bureau of Economic Research)确定的商业衰退日期。我们观察到一些有趣的模式。首先,特殊波动率表现出一定的持久性:如果它很高,它可能会在一段时间内保持在相对较高的水平。其次,特殊波动率在时间上波动很大,尤其是在商业衰退期间,它往往会上升。在20世纪90年代末的股市泡沫期间,它也有过一次戏剧性的上升。第三,也是最有趣的是,正如许多金融市场观察家所指出的那样,在过去的四十年里,特殊波动率平均有所增加:线性时间趋势约占其总变化的24%。根据标准金融理论,一家公司的股票价格等于其贴现后的预期未来现金流量。因此,特殊波动率的上升可能反映了企业层面经济表现变得更加不稳定的事实。为了调查这一假设,一些研究人员研究了公司在销售和盈利增长方面的可变性,并发现了这些指标的上升趋势。公司层面可变性的增加与美国总体经济可变性的下降形成鲜明对比。人们提出了一些尝试性的解释,以调和宏观经济和企业层面波动的不同趋势。例如,Philippon(2003)认为,这两种现象可以同时解释为商品市场变得更具竞争力企业之间的竞争放大了特殊生产率冲击的影响,这有助于解释企业波动性的上升。与此同时,竞争压力可能促使企业增加价格调整的频率,使整体经济对总需求冲击更具弹性。企业层面波动加剧对美国经济具有重要影响。例如,在特殊波动率较高的情况下,一家典型的公司可能更容易受到破产风险的影响,因此需要支付更高的违约溢价才能在债券市场上筹集资金。事实上,Campbell和Taksler(2003)发现,在1963年至1999年期间,在特殊风险较高的时期,公司债券和国债收益率之间的利差往往会扩大。这一解释与20世纪90年代末的债券市场特别相关,当时收益率利差大幅扩大,尽管投资者对美国经济的整体表现相当乐观。然而,如果我们考虑到这一时期特殊波动性的急剧上升,这一事件就不那么令人费解了。
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引用次数: 5
Trends in home ownership 自置居所的趋势
Pub Date : 1900-01-01 DOI: 10.20955/ES.2005.29
W. Gavin
Views expressed do not necessarily reflect official positions of the Federal Reserve System. The housing market appears to be cooling down after a long and prosperous run. Home prices may be retreating a bit in some of the hottest markets, but no one expects a widespread decline in home prices. One reason for this is the recent rise in home ownership rates. In 2001, there were 119.1 million housing units in the United States; 12.9 million units were vacant or seasonal, while 106.2 million were occupied as primary residences. Of those, 72 million were owner-occupied. The home ownership rate is defined as the number of units that are owner-occupied divided by the number of units occupied as primary residences. For 30 years, from 1965 to 1995, the average home ownership rate in the United States varied narrowly around 64 percent. Despite a wide variety of policies by government at all levels to stimulate homeownership, the rate seemed stuck permanently near that level. In 1995, however, the trend turned upward and now exceeds 68 percent. What explains the rise over the past decade? The demographics of home ownership may provide clues to understanding the rising trend in home ownership. The table shows that the average home ownership rate rose a mere 0.2 percent during the decade beginning in 1985. But this relatively flat trend masked considerable divergence among age groups. The home ownership rate for people aged 65 years and older rose by 3.4 percentage points, while the rates for all other age groups fell. The younger the group, the greater the decline. Since 1995, home ownership among the oldest group has continued to rise at the same rate as before. But the home ownership rates for all the younger groups stopped falling and began to rise. The turnaround was greatest for the two youngest groups. Understanding these trends requires an understanding of how the costs and benefits of homeownership have changed. Interest payments are an important part of the cost of home ownership, and mortgage interest rates have generally fallen since the early 1980s. This decline in interest rates, however, has been offset by a rise in housing prices so that the median mortgage payment as a percent of median income, though it has declined, has not declined smoothly over the past two decades. This index of housing cost fell quite dramatically, from 28.7 percent in January 1985 to 19.4 percent in December 1994. The index fluctuated between 17 percent and 20 percent after 1995 and now stands around 21 percent. A series of financial innovations has also contributed to the rise in younger home owners by allowing them to buy homes with little or no down payment. Examples include government programs by both the Clinton and Bush administrations to assist first-time buyers and the use of mortgage insurance and combination loans to reduce down payment requirements. A recent study finds that these innovations affecting the size of the down payment are the most important fac
本文所表达的观点不一定反映联邦储备系统的官方立场。在经历了长期繁荣之后,房地产市场似乎正在降温。在一些最热门的市场,房价可能会有所回落,但没有人预计房价会普遍下跌。其中一个原因是最近住房拥有率的上升。2001年,美国有1.191亿套住房;1290万套是空置或季节性的,而1.062亿套是主要住宅。其中,7200万套是自住房屋。房屋拥有率的定义是业主自住的单位数除以作为主要住宅使用的单位数。从1965年到1995年的30年间,美国的平均住房拥有率在64%上下波动。尽管各级政府出台了各种各样的政策来刺激住房拥有率,但这一比率似乎一直停留在这一水平附近。然而,在1995年,这一趋势开始上升,现在超过了68%。如何解释过去十年的增长?住房拥有率的人口统计数据可能为理解住房拥有率上升的趋势提供线索。该表显示,从1985年开始的十年间,平均住房拥有率仅上升了0.2%。但这种相对平缓的趋势掩盖了各年龄组之间的巨大差异。65岁及以上老年人的住房拥有率上升了3.4个百分点,而其他所有年龄组的住房拥有率都下降了。这个群体越年轻,下降幅度越大。自1995年以来,老年群体的住房拥有率继续以与以前相同的速度增长。但所有年轻群体的住房拥有率都停止了下降,开始上升。最年轻的两个组的转变最大。要了解这些趋势,就必须了解住房的成本和收益是如何变化的。利息支付是房屋所有权成本的重要组成部分,自20世纪80年代初以来,抵押贷款利率普遍下降。然而,利率的下降被房价的上涨所抵消,因此,抵押贷款支付中位数占收入中位数的百分比虽然有所下降,但在过去二十年中并没有平稳下降。住房成本指数急剧下降,从1985年1月的28.7%下降到1994年12月的19.4%。1995年以后,该指数在17% ~ 20%之间波动,目前在21%左右。一系列金融创新也促进了年轻购房者的增加,这些创新允许他们在很少或没有首付的情况下购买房屋。这方面的例子包括克林顿和布什政府协助首次购房者的政府项目,以及利用抵押贷款保险和组合贷款来降低首付要求。最近的一项研究发现,这些影响首付款金额的创新是解释住房拥有率上升的最重要因素,尤其是对年轻人和首次购房者而言。参见Matthew S. Chambers, Carlos Garriga和Dan Schlagenhauf,“住房拥有率变化的核算”,佛罗里达州立大学,2005年。
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引用次数: 6
Multinationals make the most of IT 跨国公司充分利用了信息技术
Pub Date : 1900-01-01 DOI: 10.20955/ES.2008.14
Silvio Contessi
Views expressed do not necessarily reflect official positions of the Federal Reserve System. The U.S. dollar has depreciated by more than 26 percent in trade-weighted terms since its peak in 2002. The lower relative prices paid by foreigners for U.S. goods and services are expanding exports and helping reduce the current account deficit. At the same time, however, there is concern over a potential “firesale” of U.S. firms—i.e., a case in which U.S. firms become so cheap that foreign investors trigger a new wave of international takeovers. Although economic theory has no clear-cut way to forecast the welfare effects of international changes of ownership or entry of new foreign firms, empirical research can shed light on how multinational corporations have contributed to aggregate productivity. And wages—as discussed previously in this publication1—tend to track productivity. Thus, understanding how multinationals affect productivity growth can help to evaluate the impact of foreign acquisitions on the U.S. economy. U.S. labor productivity (output per hour) has increased at an average annual rate of 1.84 percent between 1977 and 2006—faster than most countries, at least since 1995. To help find the source of this impressive productivity, we can separate U.S. gross domestic product and productivity growth into that produced by exclusively domestic firms and that produced by multinational firms (i.e., foreign firms with U.S. production units and U.S. firms with foreign production units). The results of a recent study2 show that private multinational nonfarm, nonfinancial firms contribute only 40 percent of the output of nonfinancial corporations but more than 75 percent of the increase in labor productivity between 1977 and 2000. Moreover, all of this new productivity in nonfinancial corporate sectors in the late 1990s can be traced back to multinationals. How have such large productivity gains been possible? Various studies suggest that the productivity advantage of multinationals is caused by technological and organizational advantages that are specific to these firms, rather than to the country in which they operate. Although similar technologies are available at approximately the same prices to both multinational and non-multinational firms, the management structure of multinationals allows them to use new technologies more efficiently, particularly information technologies (IT). The largest productivity advantages are recorded in sectors that make substantial use of IT, such as retail and wholesale, and sectors with superior people management. As the authors of one of these studies put it: “It ain’t what you do...but the way you do IT.”3 Hence, even though the ownership of some companies may be transferred abroad because of a “firesale” effect, these firms, along with U.S. multinationals, provide an important contribution to U.S. productivity growth and ultimately to the growth of wages, particularly in ITintensive sectors. —Silvio Contessi
本文所表达的观点不一定反映联邦储备系统的官方立场。自2002年达到峰值以来,美元的贸易加权汇率已经贬值了26%以上。外国人购买美国商品和服务的相对价格较低,正在扩大出口,并有助于减少经常账户赤字。然而,与此同时,人们担心美国公司可能会被“贱卖”。在美国,美国公司变得如此廉价,以至于外国投资者引发了新一轮的国际收购浪潮。尽管经济理论没有明确的方法来预测所有权的国际变化或新外国公司的进入对福利的影响,但实证研究可以揭示跨国公司如何对总生产率做出贡献。而工资——正如本出版物之前所讨论的——倾向于与生产率挂钩。因此,了解跨国公司如何影响生产率增长有助于评估外国收购对美国经济的影响。从1977年到2006年,美国的劳动生产率(每小时产出)以平均每年1.84%的速度增长,至少从1995年以来比大多数国家都快。为了帮助找到这种令人印象深刻的生产率的来源,我们可以将美国的国内生产总值和生产率增长分为完全由国内公司生产的和由跨国公司(即拥有美国生产单位的外国公司和拥有外国生产单位的美国公司)生产的。最近的一项研究结果表明,私营跨国非农业、非金融企业只贡献了非金融企业产出的40%,但在1977年至2000年间,它们对劳动生产率增长的贡献却超过了75%。此外,20世纪90年代末非金融企业部门的所有这些新生产率都可以追溯到跨国公司。如此巨大的生产率增长是如何可能的?各种研究表明,跨国公司的生产率优势是由这些公司特有的技术和组织优势造成的,而不是由它们经营所在的国家造成的。虽然跨国公司和非跨国公司都可以以大致相同的价格获得类似的技术,但跨国公司的管理结构使它们能够更有效地使用新技术,特别是信息技术。最大的生产力优势记录在大量使用IT的行业,如零售和批发,以及具有卓越人员管理的行业。正如其中一项研究的作者所说:“重要的不是你做了什么……而是你做事的方式。因此,尽管由于“贱卖”效应,一些公司的所有权可能会转移到国外,但这些公司与美国的跨国公司一起,对美国生产率的增长做出了重要贡献,并最终对工资的增长做出了重要贡献,尤其是在信息技术密集型行业。西尔维奥•Contessi
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引用次数: 0
Metropolitan growth: sun belt vs. snow belt 都市发展:阳光带vs雪带
Pub Date : 1900-01-01 DOI: 10.20955/ES.2004.24
Rubén Hernández-Murillo
Views expressed do not necessarily reflect official positions of the Federal Reserve System. Metropolitan Growth: Sun Belt vs. Snow Belt For more than a century, cities in the United States with more skilled residents have grown faster than comparable cities with fewer educated people.1 The reasons why the relationship between skills and population growth is so persistent are not clearly understood. One explanation proposes that skills (measured by the percentage of residents with a bachelor’s degree) foster growth because an educated population is an indicator of favorable quality of life, which attracts more people to a city. An alternative explanation argues that having skilled residents allows cities to grow because educated people adapt more easily to a constantly evolving economy. The latter explanation views skills as a production amenity, whereas the first views skills as a consumption amenity. Recent evidence suggests that productivity drives most of the connection between skills and growth, especially in metropolitan areas, supporting the production amenity explanation. Economists Edward Glaeser and Albert Saiz have found that education levels have a positive impact on the growth of wages and housing prices, as a result of rising productivity. If skills are merely consumption amenities, they argue, then wages would decline following migration to a city.2 Interestingly, the relationship between skills and city growth does not hold among all types of cities. In the latter part of the 20th century, cities with warm and dry climates have dominated the list of the fastest growing metropolitan areas, in terms of both population and employment growth.3 A favorable climate, especially since the advent of air conditioning, seems to have spurred growth in such areas without relying on a high level of education in the local population. The correlation between skills and growth, however, seems to be more important in cold and wet metropolitan areas (the Snow Belt) than in warm and dry locations (the Sun Belt). The chart presents the correlation between the fraction of residents aged 25 years or older with college degrees as of 1990 and population growth in 155 Snow Belt metropolitan areas over the 1990-2000 decade. The correlation between skills and population growth is 0.52 and the relationship is statistically significant. The line of best fit in the chart suggests that, as the fraction of people with bachelor’s degrees increases by 1 percent, population growth in the following decade increases by 1.2 percent. A similar exercise among Sun Belt metropolitan areas reveals no significant correlation between skill levels and subsequent population growth, perhaps, in part, because the Sun Belt receives a disproportionate share of the immigrant population. The same pattern arises if, instead of population growth, one examines employment growth, as measured by the change in the number of employed civilians aged 16 years or older. The correlation between
本文所表达的观点不一定反映联邦储备系统的官方立场。都市发展:阳光带与雪带一个多世纪以来,拥有更多技术居民的美国城市比受教育人数较少的可比城市发展得更快技能和人口增长之间的关系为何如此持久,原因尚不清楚。一种解释认为,技能(以拥有学士学位的居民比例来衡量)促进了经济增长,因为受过教育的人口是良好生活质量的一个指标,而良好生活质量会吸引更多的人来到一个城市。另一种解释认为,拥有技术熟练的居民可以让城市发展,因为受过教育的人更容易适应不断发展的经济。后一种解释将技能视为一种生产便利,而第一种解释将技能视为一种消费便利。最近的证据表明,生产力推动了技能与增长之间的大部分联系,尤其是在大都市地区,这支持了生产便利的解释。经济学家爱德华·格莱泽(Edward Glaeser)和阿尔伯特·赛兹(Albert Saiz)发现,由于生产率的提高,教育水平对工资和房价的增长有积极影响。他们认为,如果技能仅仅是消费便利,那么移民到城市后工资就会下降有趣的是,技能与城市发展之间的关系并不适用于所有类型的城市。在20世纪后半叶,气候温暖干燥的城市在人口和就业增长方面都是增长最快的大都市区有利的气候,特别是自空调出现以来,似乎刺激了这些地区的增长,而不依赖于当地人口的高水平教育。然而,技能与成长之间的相关性似乎在寒冷潮湿的大都市地区(雪带)比在温暖干燥的地区(阳光带)更为重要。该图表展示了1990年25岁及以上拥有大学学位的居民比例与155个雪带大都市区1990-2000年间的人口增长之间的相关性。技能与人口增长的相关系数为0.52,具有统计学意义。图表中的最佳拟合线表明,拥有学士学位的人口比例每增加1%,接下来十年的人口增长率就会增加1.2%。在阳光地带的大都市地区进行的类似研究表明,技能水平与随后的人口增长之间没有显著的相关性,部分原因可能是阳光地带接收了不成比例的移民人口。如果不考虑人口增长,而考察就业增长(以16岁或以上的就业平民人数的变化来衡量),也会出现同样的情况。90年代雪带大都市区的就业增长与初始技能水平的相关系数为0.39,而阳光带大都市区的相关系数仅为0.03。一个警告——我们可以称之为拉斯维加斯的解释——是相对低技能的服务工作者占了阳光地带都市地区常住人口的很大一部分,尽管在任何给定的时间里,这个城市受过大学教育的人的比例——包括游客和雪鸟——实际上可能相当高。
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National Economic Trends
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