My piggy bank is beating the stock market—the pig, not the coins. It’s made from rigid plastic, and I’ll bet you two old milk jugs and a shampoo bottle that it’s HDPE, or high-density polyethylene. The price of that stuff has doubled in a year. I’m leaving my pig where it stands on my shoe rack—let your winners run, momentum investors say.
HDPE is the world’s most common plastic. The business was barely a decade old in 1967, when The Graduate hit screens and Mr. McGuire gave Ben his famous one-word career advice. McGuire…
