The Ample-Reserves Regime — What Actually Constrains Bank Lending (2008- )
mechanismMoney & Finance
Banks have not been limited by reserves since 2020. Almost nobody updated the story.
Who they are
The Federal Reserve, in its own published rules.
What they do
The old picture — banks must keep a fraction of deposits on hand, and the Fed controls lending by making that fraction scarce — no longer describes anything.
How it works
The Fed's own page: reserve requirement ratios were reduced to zero percent effective 26 March 2020, and they are still zero. Rates are now set by paying banks interest on the reserves they hold. What actually limits lending is capital rules — how much of a bank's own money has to sit behind its loans.
Why it matters
The site had nothing at all on this. It doesn't change the 2032 reading, which runs on the clearing system rather than bank lending, but it fills the floor underneath it.
The engine's record — word for word
The engine held no record of how bank credit is bounded in the present regime. Before 2008 the Federal Reserve steered rates by managing the scarcity of reserves, and statutory reserve ratios capped deposit expansion. That regime is over. The Federal Reserve states: 'the Board reduced reserve requirement ratios to zero percent effective March 26, 2020', and the requirement remains zero for all liability types. Rates are now administered — set by paying Interest on Reserve Balances and by the overnight reverse repurchase facility — rather than by rationing reserves. What binds lending instead is regulatory capital: Basel III's Common Equity Tier 1 minimum, the total capital ratio with its conservation buffer, the leverage ratio, and the liquidity and stable-funding ratios. ENGINE RELEVANCE: this sits one layer beneath settlement_layer, where the engine's 2032 mechanism lives. It does not alter that mechanism, which runs on clearing and netting rather than bank lending; it closes a gap under it. Recorded as regime description, not forecast. Apex (c) compound-path: a documented operational change, no coordination claimed.
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