国际货币基金组织：周期性财政乘数：政策组合与金融摩擦之谜（英文版）

This paper investigates dynamic relationships between U.S. government expenditure multipliers and the economy's cyclical position from 1949 to 2018 using a Time-Varying Parameter Vector Autoregression (TVP-VAR) model. We challenge the existing literature, which predominantly relies on predefined economic regimes and assumes a stable relationship between fiscal multipliers and business cycles. Our findings identify two distinct periods: fiscal multipliers were counter-cyclical from 1949 to