Nasdaq Composite exits bear market — once again. What history says happens next.

Once more, with feeling.

The Nasdaq Composite COMP eked out a gain Monday, but the advance was enough to meet widely used criteria for marking an exit from a bear market.

But investors don’t need a long memory to recall that the last such exit from a bear market, on Aug. 10, proved short-lived. The tech-heavy index peaked just a few trading…