Poor buying when things expensive they are expert buying top in everything and FOMO in also the middle class are expert on buying highest prices and not just buying they buy it with credit.
Poor and the middle class are living to impress others. Not all for both classes but many of them are. Even they cannot afford that type of lifestyle, they're trying to still impress and think that it is how life goes.
Rich buys when something is with good price low price poor buys just to spend money.
Middle class behave like poor too they buying expensive.
Not all middle class are like that.
They also know when to buy but when that opportunity comes, they just can't because they're not prepared and they have no allocation for particular assets that have dipped.