[s1artibartfast]

The key terms in this discussion are disposable income and discretionary income.

Housing share if income has outpaced inflation, as have many other categories.

You can simultaneously make more and have less if your income doubles but rent goes from 25% to 50%

[abustamam]

I remember reading in a personal finance book, it's not about what you earn, it's about what you keep. I think the concept applies here too, even if the context is slightly different.