State x requires that persons who prepare and serve liquor in the form of drinks at commercial establishments be licensed by the state to do so. the only requirement for obtaining a yearly license is that the person be at least twenty-one years old. mickey, aged thirty five, is hired as a bartender for the southtown restaurant. gerald, a staunch alumnus of a nearby university, brings twenty of his friends to the restaurant to celebrate a football victory one afternoon. gerald orders four rounds of drinks, and the bill is nearly $600. when he learns that mickey has failed to renew his bartender's license, gerald refuses to pay, claiming that the contract is unenforceable