If I had a billion dollars, I would start a foundation with a $100 million endowment invested in mutual funds that exclusively support certified B corporations with high ESG scores. Expecting about a 5% APY, that endowment would accrue interest at about $5 million annually.

That's enough for potentially up to 50 six-figure salaries. I would hire experts, scholars, activists, and advocates through the foundation and pay them to make the world a better place. I'd have a hand in writing the overall policies and guiding values, to make sure they prioritize the causes I believe are important. And I'd hire someone to audit their performance and send me reports.

I'd spend my life fucking off with more money than I'd ever need, because my $900 million remaining would still be accruing ungodly amounts of annual interest.

And every few years when my wealth surpasses a billion again, I'd take another $100 million and start a new foundation with a slightly different focus, or I'd put it into the endowment of the existing foundation and have them grow as an organization.

I would never let the sun set on a billion dollars. Because nobody needs a billion dollars.