All Your Eggs

Late 2000. A young employee works at a booming energy company that everyone calls one of the best-run businesses in America. Its stock has climbed for years.

Feeling confident, the employee puts almost all of their savings — and their entire retirement account — into that one company's stock. Their reasoning: "I work here, I trust it, and it keeps going up."

You don't need to know anything about the company's finances to judge the plan itself.