Our latest Well informed column concerns a topic close to many people’s hearts: cholesterol. Your doctor will tell you that eating the right foods can be as effective as pills to lower the amount of it in your blood. Fad diets are a dime a dozen, but there is one approach that really seems to work.

And informational asymmetry is what economists call a rip-off. When a seller has an information advantage over a buyer, customers get screwed over. But imparting a lot of knowledge is one thing artificial intelligence is good at. Could AI end the rip-off economy?