well if you want a basic idea of how prices work, then study some economics, as that's a big part of the fundamentals economists learn. Essentially a bunch of funny curve shapes that try to guess how much people will want to pay for something. Those curves change shape based on interest rates, how necessary an item is, how easy or cheap it is to make a lot instead of a little, and so on and so forth. We can use them to predict stuff but so much of economics is ultimately unpredictable because it relies on human factors.

In terms of how you behave, there's a few elements to it. With events, the window of opportunity is limited, while you can put off a new device purchase, you can't postpone the concert as an attendee, so you can't wait for a sale and FOMO is strong. Many things where you tend to impulse buy are presented as an offer you "can't put off til later", so you have to step back to see if you really need it now. Best way to try to even it out is to budget before you start checking current prices and see how they compare.