為什麽經濟衰退大多發生在共和黨的任期內

突然有個有趣的現象浮現出來，就是從1980年開始，為什麽經濟衰退大多發生在共和黨的任期內。這個問題很有意思。

1980 recession	Jan–July 1980
Early 1980s recession	July 1981 – Nov 1982
Early 1990s recession	July 1990 – Mar 1991
Early 2000s recession	March 2001–Nov 2001
Great Recession	Dec 2007 – June 2009[49][50]