This is difficult to explain. I can’t figure out a rule of thumb for spending, the prices of things fluctuate so quickly it’s confusing. Here are some examples
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A house, prices are out of control, inventory is low, sellers are greedy. I’m feeling not only unable to afford it but finding lack of value in inflated prices
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Computer parts. Relatively cheap compared to pandemic but more expensive than before but also much cheaper than 90s/00s, but still could be cheaper
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TWS earbuds, completely different ball game from regular earbuds, disposable electronics.
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Food. Nights out with drinks now sometimes cost me more than 2 & 3, but seem like just keeping up with inflation
The prices range from 100,000s to 100s, but some are fleeting, some semi permanent, some last a long time. I also spend hours researching prices of parts and waiting for sales, but spending the same amount on social events in an instant
To be fair if the goal is understanding why, then even things like goods not being substitutable are useful for understanding. The OP wanted to know why, not know how to predict them accurately. The original suggestion to learn economics would teach them that.