Because Central Bankers such as Alan Greenspan want it that way.
“The business cycle” is just a con to stop Americans from becoming too wealthy.
After all, too much prosperity is bad for the loan business.
Every time the US econ ramps up, the central bankers have to put on the brakes, lest the people pay off all their debt and put the bankers out of biz.
It’s all a manipulated joke.