Do you hold that people earning (say) 30k actually spend more dollars on clothing than people earning 50k, per annum? (In similar job types, similar area, etc.)

Do you hold that people earning (say) 30k actually spend more dollars on clothing than people earning 50k, per annum? (In similar job types, similar area, etc.) This is the claim of the boot story, and I don't buy it. Although it would be nice to have data. I guess the technical term is something like "inferior good", and I thought such things were rare beasts, not such broad categories as clothing. (Perhaps things like fake-leather belts would qualify). Do they spend a larger proportion of their income on clothing? This could go either way, I think, rent hurts. But that's a different question to the boot one: If they spend more only in proportion, not in dollars, then they spend the same or less!