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  • For plane tickets the day of the week definitely matters. Airlines bump up the prices on Sundays, and research show that Tuesdays usually are the cheapest.

    I wouldn't surprise me if retailers do the same, throw in free shipping for example, on a slow weekday. Just trying to figure out when that would be.

  • wouldn't surprise me if retailers do the same

    It would surprise me a bit, in the case of online sales of durable goods. It would appear to rely on several propositions being both true and detectable above the noise:

    1. Weekly cyclic variability of demand
    2. Material cost savings in fulfilment from the achievable smoothing of demand
    3. Sufficiently strong price responsiveness of demand to make the savings from 2 exceed the cost of price reductions
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