Let’s say you and your roommate have a little side business baking rhubarb pies at home and selling them on a street corner. Folks love pie, and you’re having trouble keeping up with demand. But you ...

“We can use some fancy math to predict how long the line will get,” Keely Croxton of Ohio State says, then apply it to related problems. In response to a listener request, “Marketplace” host Kai ...