What is the main reason banks avoid holding excess reserves?

Question

BlackTom AI · Accepted Answer

Reserves that earn no interest create a clear opportunity cost: funds held as excess reserves could instead be lent or invested to earn interest. Banks must meet required reserves set by the central bank; any reserves held above that level are “excess.” If those excess balances earn zero interest at the Fed, each dollar held instead of lent or invested forgoes the return it could have produced.

Relevant concepts:
- Required vs. excess reserves: required reserves are mandatory holdings; excess reserves are discretionary.
- Opportunity cost: the forgone return from not using funds in the next-best alternative (lending or buying securities).
- Interest on reserves: if the central bank does not pay interest on reserves, holding them yields zero nominal return.

Step-by-step reasoning (with a numeric illustration):
1. Suppose a bank has $1,000,000 in excess reserves and lending opportunities that yield 5% annually.
2. If reserves earn 0% at the Fed, the bank forgoes 0.05 × $1,000,000 = $50,000 in interest per year by holding those reserves.
3. That forgone $50,000 is the direct cost of holding excess reserves, so the bank prefers to lend or invest instead.
4. Thus, when reserves do not pay interest, banks avoid holding excess reserves to maximize profits.

Why the correct answer is correct:
- The statement “The Federal Reserve does not pay interest on reserves” captures the core reason: holding excess reserves means earning no return, creating a negative incentive relative to lending or investing. Historically (and in many textbook contexts) the Fed did not pay interest on reserves, making this the primary deterrent.

Why the other options are incorrect:
- Fed monitoring: while regulators monitor reserves, monitoring alone doesn’t make reserves costly; it’s the forgone interest that matters.
- Depositors: depositors do not generally penalize banks for holding reserves; deposits are governed by bank policy and insurance, not direct depositor pressure about reserve levels.
- 10% penalty: the Fed does not impose a blanket 10% penalty on excess reserves; penalties do not explain typical behavior.

Conclusion: The best answer is “The Federal Reserve does not pay interest on reserves.”

What is the main reason banks avoid holding excess reserves?单项选择题

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