The document discusses the legal doctrine of frustration in contract law. It provides examples of cases where contracts were found to be frustrated due to unforeseen circumstances, such as an artist falling ill before a scheduled performance. However, frustration cannot be claimed if a contract has simply become more difficult or expensive to perform, if some purpose of the contract can still be achieved, if the parties foresaw the frustrating event, or if the frustration was self-induced. The document analyzes cases that demonstrate when frustration will not be accepted, such as when an alternative shipping route was available despite higher costs, or when only part of a contract's purpose was cancelled.