Detailed Answer
(a) Events occurring after a contract is entered into
usually do not affect performance. Some exceptions to this rule
include subsequent illegality of the performance, death of a party,
or destruction of the subject matter, all of which constitute impossibility
of performance. In this case, even though Maco’s own
potatoes were destroyed, it wasn’t specified that Maco’s own
potato crop be used to fulfill the contract. It was not impossible,
therefore, for Maco to perform, because he could have purchased
potatoes from another grower to deliver to LBC. If there had
been a worldwide infestation of the potato crop, Maco would
have reason to not perform on the basis of impossibility.