Business capital and investment are increasingly moving abroad as globalization occurs, and worldwide economic integration is accordingly strengthened. The extremely low personal saving rate in the United States and the extremely high personal saving rate in China are always a concern for economists. This project uses data from the United States and economic and econometric methodologies to analyze and discuss several economic factors that affect the U.S. personal saving rate. The result shows

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... hat the housing and stock market booms, an increasing interest rate, and a decrease in the ratio of workers to retirees cause the decrease in personal saving rate, and there is strong evidence that an increased social security tax also leads to a decrease in personal saving rate.