摘要

Introduced the lag variables for income based on the Keynes consumption function which is expanded into the dynamic consumption function to interpret the marginal effects of present income and past savings on present consumption. Koyck transformation transfers infinite distribution lag model into first-order auto regression model that greatly saves the freedom degree and reduces the numbers of unestimated parameters. Finally making a research through taking urban dwellers in Shandong province as an example to reveal it's dynamic evolution which provided decision-makers with some proofs.