Stock indexes are making record highs again, and investors feel wealthier. Does it matter?

THE S&P 500 stock index topped 5,000 for the first time on Feb. 9, 2024, exciting some investors and garnering a flurry of media coverage. The Conversation asked Alexander Kurov, a financial markets scholar, to explain what stock indexes are and to say whether this kind of milestone is a big deal or not.

What are stock indexes?

Stock indexes measure the performance of a group of stocks. When prices rise or fall overall for the shares of those companies, so do stock indexes. The number of stocks in those baskets varies, as does the system for how this mix of shares gets updated.