When you buy a complex gadget, chances are it’s not going to come with a repair manual. Instead, manufacturers may take the product in, or expect you to purchase a new one when the latest model comes out. This has led to a boom in the repair industry and has inspired countless people to dissect pieces of technology and create their own manuals.

Marketplace Tech host Ben Johnson explains the boom and bust of the repair industry and introduces the idea of a “teardown.”