Ya’ll, this already happens - wholesale and retail pricing vs consumer pricing. This exact principle is why many states refuse sales tax - those disproportionately affect poorer people because a lot of rich people can buy items through their LLCs and get bulk or retailer pricing.
Costco has memberships based on this - there’s the regular and then the executive memberships. You spend more on the higher level memberships (essentially an income check) and also get more money back later. Credit card promos function like this. Credit scores and loans function like this.
Grocery stores (capital) will never give us a break on food (money). They will always try to find a way to make the poor pay even more. That’s why it’s called capitalism - all that is valued is capital and capital accrues more capital. That’s the game.