“The supply chain stuff is really tricky.” ~Elon Musk, CEO of Tesla and SpaceX

A concept that might be tricky, is something called the bullwhip effect.

Bullwhips are tools that are used to make animals move. They are used to create a small sonic boom and can be dangerous to the animal or anything in the way. A bullwhip has a large handle, with a tapered lash, that varies in length. Then at the very end of the whip is a popper. The handle is moved, and the physical waves move progressively faster when the whip is flicked until they end at the popper, which provides a loud popping sound, moves incredibly fast, and is quite dangerous.