The first lesson I learned about investing at the age of 11 was to know which way the market was going. Is it going up or down? It sounds too simple, but it’s the last thing most people consider.

AI optimism is driving the S&P 500 price-to-book ratio to records, surpassing dot-com levels. High valuations reflect expectations for AI-driven earnings. While the ratio's level is head-turning, it ...

The sharp rally in AI-related tech stocks over the past year has brought up old memories of the 1999 dot-com bubble. Some investors have warned that the stock market is exhibiting similarities today ...

Investors have grown more concerned over the run-up in tech stocks and valuations of private AI companies, stoking fears of a bubble. WSJ’s Hannah Erin Lang uses three charts to explain what’s behind ...