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We derive an optimal strategy for minimizing the expected loss in thetwo-period economy when a pivotal decision needs to be made during the firsttime period and cannot be subsequently reversed. Our interest in the problemhas been motivated by the classical shopper's dilemma during the Black Fridaypromotion period, and our solution crucially relies on the pioneering work ofMcDonnell and Abbott on the two-envelope paradox.

Should we opt for the Black Friday discounted price or wait until the Boxing Day?