Dear Dave, My husband started working at a new company about a year ago. As part of his sign on, they gave him $5,000 in company stock. The stock has nearly doubled in value since then, and we were wondering if we should buy more, considering how well it has done. Cathi   Dear Cathi, I totally get why you two might be excited over a stock that doubled in value over the course of a year. But what you’re talking about doing right now is a very risky proposition. The truth is any stock that doubles in value over the course of just one year is highly volatile. It’s unusual for stocks to do things like that, and it also means it could go down just as fast—or even faster. I don’t know where you and your husband are in your overall financial situation, but I recommend people become debt-free except for their …