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Re:A Black Hole Engulfing the World's Bond Markets by UncleEntity on Sunday July 28, 2019 @01:03PM (#20548562)
Banks hold their excess reserves at the Federal Reserve[0] and receive interest on top, currently 2.35%. Scales up to at least a couple trillion give or take a few hundred billion.

[0] https://fred.stlouisfed.org/series/WRESBAL

Re:A Black Hole Engulfing the World's Bond Markets by toast0 on Sunday July 28, 2019 @02:45PM (#20549152)
European banks hold their excess reserves (or at least their required minimum reserves) at the European Central Bank or their country's central bank; all of which are currently charging interest for the privilege.