With growing inequality and ever decreasing costs of consumer goods one possible solutions I thought of was a dynamic pricing system whereby goods cost a certain amount commensurate to your income. So essentially a tiered wealth tax. Maybe it could work over a basket of goods as opposed to individual items; Would such a system be viable and if so, welfare improving? It just seems consumer goods are far too cheap and it seems odd that somebody who earns multiples of someone on minimum wage should pay the same price for their shopping and even discretionary goods.
It's not very well thought out but just a thought that came to my head. Would it even be efficient or overcome any problems that cannot be alleviated through more conventional tax system?