If an economic recession triggers a significant decline, how would I buy at the bottom? Today, I happened to talk to a friend about this issue. I would like to share my personal opinion. Just my personal opinion does not necessarily mean it is correct. The data used are all economic recession data after 2000. 1. Use S&P 500 as a reference Economic recession often brings about a decline in the risk market, and S&P is basically a good reference: A.