That’s a good point. But taking that into account would require you to be able to predict the future price, with some level of certainty. What I’m thinking, and

That’s a good point. But taking that into account would require you to be able to predict the future price, with some level of certainty. What I’m thinking, and I may be wrong, is that past prices, or whether an item is truly “on sale”, don’t really help you to do that. If they could, then technical analysis in stock trading would be something other than superstition, which it is not.