U.S. foundations currently hold about $1 trillion in assets, for which their founders have already received tax deductions. While some foundations (including huge ones like the Walton Family Foundation and the Bill and Melinda Gates Foundation) choose to pay out more than 5% per year, overall, the average hovers pretty close to 5%. So if the payout requirement changed, it would vastly increase the amount of money circulating for issues, communities and causes of all kinds.