Wood v. Lucy, Lady Duff-Gordon is a landmark case that highlights the principles of contract law, particularly concerning mutuality of obligation and the presence of illusory promises. In this case, Lady Duff-Gordon granted Wood the exclusive rights to market her clothing designs but did not specify any minimum quantity or guarantee sales, leading to questions about whether her promise created a binding obligation. The court found that Wood's commitment to use reasonable efforts in promoting her designs constituted sufficient consideration, thus upholding the enforceability of the contract.