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