Jan opens a sandwich shop across the street from another sandwich shop run by Amy. Amy is disturbed by this competition, and she agrees to pay Jan $5000, in exchange for Jan's promise to quit the business and not to engage in a similar business within ten-mile radius of Amy's business. Is this contract legal and enforceable? Why or why not? If the agreement is not enforceable, how might Jan and Amy restructure it to increase its chances of being legal?