Alvin E. Roth

The simple model of a bridge is great, and you could not build a bridge without understanding it well. But if you're actually building the bridge, you need to know the site. A lot of economics is like that: When prices go up, demand is gonna go down. You can't forget that and run your economy. But it's not the only thing you need to know.

Stacey Napp understands the ugly side of divorce - which is often the side that involves money. In fact, she understands it so well that in 2008 she started a business, Balance Point Divorce Funding, which invests in divorce and probate litigation, helping clients cover costs in exchange for a share of the winnings.

Every time you log in to Facebook, every time you click on your News Feed, every time you Like a photo, every time you send anything via Messenger, you add another data point to the galaxy they already have regarding you and your behavior.