I see I forgot to transfer the snip (from Snood's article snip a bit earlier):
quoting that snip -
You have proposed, for example, to pay for universal free public college with a tax on Wall Street speculation. Hillary Clinton had previously proposed such a tax, sans the promise that it would cover such a large expense. It's called a Tobin tax. The idea dates back to 1972, and is meant to stabilize markets.