Geometric returns are, in a way, the primary cause of wealth inequality. However, if everyone starts at the far left flat end of the curve, it's a fair playing surface allowing for meritocratic rewards for those who provide outsize value.
On the other hand, if you start at the parabolic upward portion of the geometric return curve, having demonstrated no value of your own, you've destroyed meritocratic rewards.
The founding fathers were historically against generational wealth, after all, they fled such a system in Europe.
> It seems like income taxation and social subsidies O(t) are unlikely to outcompete exponential processes as ameliorations for the root problem.
Taxation can absolutely outcompete potential exponential processes, that's why we have progressive taxation. Progressive taxation is exponential in dollar terms.
Progressive wealth taxation is another way of approaching this, but so is an estate tax. That short-circuits the whole process.
To be clear, I believe in wealth inequality, and I believe in income inequality, so long as it's coupled with social mobility (i.e. everyone has the ability to reach higher tiers), and so long as the minimum standard is a decent existence, not death.