A comparative study on the effects of high-speed rail and ordinary rail on regional economic growth—empirical research based on DlD model

: Today, high-speed rail has become an indispensable means of transportation in people's production and life. However, after the opening of the high-speed rail, the development of ordinary railways has also become an object of concern, and the impact of high-speed rail on ordinary railways is worth studying from an empirical perspective. This article takes more than 2,000 counties and cities in China as the research object, using the data from 2004 to 2018, using the double difference method to analyze the impact of high-speed railway construction and ordinary railway construction and further fitting the relationship between high-speed railway and ordinary railway. The research results show that: the opening of high-speed railways has a negative effect on the regional economy; the opening of ordinary railways has a positive effect on the regional economy. By analyzing the interaction effect of the opening of high-speed rail and ordinary railway, it can be concluded that the opening of high-speed rail has a restraining effect on the impact of ordinary railway on regional economic development.