Grover creates a machine that enables a manufacturer to make screws with 50 percent less waste than the industry norm. He patents his process and then decides to license the patent to Markham...

Grover creates a machine that enables a manufacturer to make screws with 50 percent less waste than the industry norm. He patents his process and then decides to license the patent to Markham Manufacturing for a small royalty fee and a promise that Markham will buy a key ingredient needed to produce the screws from Grover. Is there anything wrong with this contract?