Agree. We should also probably expect it to happen: the income distribution is very heavy tailed, and it becomes easier to donate the more money you have, so we should probably expect the largest couple of donors to account for most of the money.
Otoh, the total US non-profit sector is something like 300 billion per year, and I think billionaire philanthropy is under $30bn, so that would suggest 10% from billionaires as a base rate. (Though a lot of this is to fund local services, churches etc. where we might expect a broader base.)
As another data point, this OECD report says that from 2013-15, half of all philanthropic funding for international development came from the Gates Foundation ($12 billion out of $24 billion total).
Agree. We should also probably expect it to happen: the income distribution is very heavy tailed, and it becomes easier to donate the more money you have, so we should probably expect the largest couple of donors to account for most of the money.
Otoh, the total US non-profit sector is something like 300 billion per year, and I think billionaire philanthropy is under $30bn, so that would suggest 10% from billionaires as a base rate. (Though a lot of this is to fund local services, churches etc. where we might expect a broader base.)
As another data point, this OECD report says that from 2013-15, half of all philanthropic funding for international development came from the Gates Foundation ($12 billion out of $24 billion total).