We've all heard the timeless warning "If it sounds too good to be true, it probably is." It’s great advice, but the trick is figuring out when "good" becomes "too good." And if you have a good salesperson—or worse, a dishonest one—it gets really hard.

While there's no clear way to know, in just four questions our Scam Meter will help you tell if an investment you are thinking about might be a scam.