[nostromo]

QE is revenue neutral or positive. They buy an asset with created cash, and sell it later for a small profit.

Helicopter money is revenue negative and the created cash cannot be recovered.

[burroisolator]

QE is revenue neutral in theory just like helicopter money along with taxing that same amount back on a future date is revenue neutral in theory. In practice it is more like "buy $4 trillion worth of assets with created cash and never be able to sell it for fear of creating a liquidity crisis": https://fred.stlouisfed.org/series/WALCL.

[bcrosby95]

And they buy assets at whatever price is required for the financial institution to remain solvent. At least, that's what happened during the mortgage meltdown.

[dredmorbius]

Sure it can: tax it out of existence. Or apply deflationary monetary policy; braise interest rates, increase reserve requirements, or sell bonds.