I was only replying to a comment that acknowledged supply changes could affect prices, but seemed to intentionally downplay changes in demand having any effect

I was only replying to a comment that acknowledged supply changes could affect prices, but seemed to intentionally downplay changes in demand having any effect (which is why my hypothetical millionaire has to buy so many lattes that coffee shops were running out; having people with more disposable income doesn’t change demand until they spend that income). Sadly I am not a millionaire myself, and have no firsthand knowledge about how they spend their riches.