Una comparación del gasto por tres niveles de ingreso para Colombia bajo una estimación del sistema de ecuaciones de demanda Working y Leser y del Sistema Lineal de Gasto Extendido 2008

ABSTRACT One of the main questions of economics is how to address the issue on the measurement of inequality and gap between the poor confronted with the higher income population, different studies oriented to being a complex question and there is a specific theory around this issue. One way of measurement is the calculation of monetary poverty and how the population of an economy is distributed around a poverty line or minimum wage.  The following article presents theoretical considerations of the classical theory of rational choice, underlying two traditional systems of demand equations, to be used as a tool to model the behavior of Colombian households, using information from the survey of quality of life 2008, then to relate the standard of living and socio-economic conditions with the expense or income of the population.  In particular for the Colombian case it shows that 40% of households are poor while another 40% of households only have per-capita income above the poverty line but below the monthly minimum wage; thus the questions about the standard of living of the Colombian population, access to basic homogeneous goods, subsistence consumption, the socio-economic gap and social exclusion arise