Money is a lot of things. It is fungible. It is also an asset. The amount of wealth- assets- outside of their houses that taxpayers who are not in the .1% hold

Money is a lot of things. It is fungible. It is also an asset. The amount of wealth- assets- outside of their houses that taxpayers who are not in the .1% hold has become an increasingly tiny fraction of the overall total asset base- which VASTLY exceeds the tax base that people are accustomed to thinking about (taxes on their income). Taxing the trading of these assets between one huge asset holder and another involves flows of money that generally speaking have nothing to do with most people. An analogy is- you're here in a nearly empty swimming pool a block from the beach and Bernie is talking about bringing in a pipe and a desalination plant to refill it, because there's a lot of water in the ocean. Regarding the budget, to a first approximation, these loans do not have an impact at all. Where the Govt actually holds the asset, it is merely a fiction on the balance sheet. There is no "student loan interest payments" line item on the Treasury's income statement (https://www.fiscal.treasury.gov/files/reports-statements/mts/mts0519.pdf https://www.fiscal.treasury.gov/files/reports-statements/mts...). Where the govt is a guarantor, then there are private entities that do expect to be paid, and it would be good for the govt to not be put in the position to have to pay them without another source of revenue. And it is absolutely true that from a particular perspective a transaction tax can provide an extremely useful source of revenue in the future, perhaps even offsetting personal income taxes.