Land ownership, entrenched wealth. The economy already started to shift towards selling a few exceptionally expensive items to the rich over selling a ton of cheap items to the poor years ago, and we're going to see how far it can go into "if nobody has money who's going to buy everything" before a collapse. The examples I'm most familiar with are in video games. Gacha games target whales while, in the worst cases, using free players as content for those whales who are spending thousands or tens of thousands a month. Meanwhile, the price for individual releases keeps going up to the point that there's speculation that the coming console generation the switch 2 is heralding will be the first one that isn't affordable for the average american household.

The top 10% of US earners are already behind half of all consumer spending.