Artificial-intelligence startups, like the makers of the “smart” web browser Dia, are being acquired for vast sums. But it’s ...

A double is a bubble. Colas has a simple rule of thumb to identify unsustainably high prices in a range of markets. Whenever the S&P 500 doubles in three years or less, stock prices decline shortly ...

The S&P 500 is trading at about 26 times aggregate earnings for the last 12 months, which is in the top decile since 1960.

Tech firms are sinking trillions of dollars into artificial intelligence to defend their lucrative businesses. Cloud ...

Gold’s massive breakout this month has left it pretty stretched technically. Blasting back up into extreme-overbought territory multiplies gold’s odds for an imminent rebalancing selloff. That would ...