The Boy Who Cried 'Bubble': What if He's Right This Time? What Investors Need to Consider

A boy blows through a bubble wand.

You know the story. A boy keeps shouting that there's a wolf, nobody comes, and the one time a wolf actually shows up, he's on his own.

For the past several years, financial commentators have been pointing at market valuations and warning that stocks are expensive. And for the past several years, the market has largely ignored them and kept climbing.