Only thing I can think of is moving abroad, but sending lots of young people abroad is not very sustainable from a domestic economy perspective.
What disposable income? When I was younger I had none, I was too busy paying rent and tuition,
I have observed people from the very poor homeless all the way up to multi-millionaires - his observation hold true for the vast majority. Nearly all of them are living paycheck to paycheck despite the massive amount of difference in income.
When you are young investing in education - that is tuition - is the correct call. When you finish school though many people stop investing at all instead of investing in equities.
Because taking 20% of the former leaves a lot of the population unable to pay for essential living expenses because they effectively have zero of the latter.