I'll explain why I was wondering about disposable income in a little more detail: In some dense cities in particular, renting (typical for young people prior t

I'll explain why I was wondering about disposable income in a little more detail: In some dense cities in particular, renting (typical for young people prior to property purchase) can be very expensive. My sense is that this creates a large transfer of wealth from professionals to property owners on a monthly basis. Across San Francisco or New York, for example, what percentage of the paycheck sums paid by employers is redirected to their landlords? If that percentage were to rise it would become more difficult for young people to become property owners since it'd be challenging for them to put savings aside. With that context provided: disposable income is an attempt to quantify how effectively people could save towards property purchase - regardless of whether they decide to take that route. (and to some extent it's also a 'guard metric' to detect communities that rent-seek to unsustainable levels) Edit: 'tech companies' -> 'employers' in third para, and remove assumption of high salary. This doesn't just affect tech..