Purchases can affect term premiums, market functioning, expectations, and portfolio choices. Investors may seek other assets after selling bonds. Their response depends on risk, regulation, and opportunities. Banks do not lend reserve accounts to households. The claim that each new reserve unit mechanically produces a fixed number of new loans is the wrong mechanism.
Quantitative tightening can involve sales or allowing securities to mature without replacement. Effects on reserves and deposits depend on the buyer, treasury cash management, and other central-bank liabilities. A nonbank buying a bond from the central bank can reduce its deposit and the bank's reserves. The overall balance sheet may change differently if currency demand or treasury balances also change. Policy analysis must inspect the whole sequence.
Distinguish a sale from maturity and fiscal spending
A central-bank sale can reverse the purchase entries under specified conditions. In an additional paper example, suppose a nonbank buys a central-bank-owned bond for 40 using its existing deposit. Its deposit falls by 40 and its bond holdings rise by 40. The commercial bank reduces its deposit liability and transfers 40 of reserves to the central bank. The central bank reduces both its bond assets and reserve liabilities by 40. This is deposit reduction through an asset purchase, not repayment of a private bank loan. No commercial-bank loan asset has changed.
If a commercial bank instead buys that bond for its own portfolio, its reserves fall by 40 and its bond assets rise by 40. Customer deposits need not change. The central bank again reduces bonds and reserve liabilities. Thus even reversal requires the counterparty distinction. A statement that central-bank securities fell by 40 is insufficient to infer that household deposits fell by 40. Other transactions during the reporting interval can also offset or amplify either balance-sheet change.
Maturity is a different event from a market sale. Consider a separate security that matures with a payment of 40, owed by the treasury to the central bank. Assume the treasury already has 40 in its central-bank account. Paying the maturing security reduces that treasury-account liability and removes the central bank's bond asset. Commercial-bank reserves need not change at this particular step. The central bank balance sheet shrinks because its liability to the treasury falls, not because a bank necessarily transfers reserves at maturity. How the treasury obtained its 40 must be traced separately.
For example, a prior tax payment could have reduced private deposits and bank reserves while increasing the treasury account. Alternatively, a prior bond issue to a nonbank could have exchanged private deposits and bank reserves for a new government bond. These financing steps have different implications for private asset holdings. If the treasury instead already held sufficient cash from an earlier period, the reserve effect need not occur in the maturity period at all. Looking only at the maturing security hides this timing distinction.
Interest also requires its own sequence. If reserves are remunerated, central-bank interest can add to a bank's income under the applicable rules. Government coupons received by the central bank and any later remittances to the treasury are separate flows. Changes in rates can alter these flows even if the purchase originally exchanged equal market values. None makes the initial principal payment an unconditional grant of bank equity. An assessment of public finances must specify which institutions are consolidated and which period's income is being measured.
To evaluate a QE claim, first identify the asset, transaction price, seller, settlement bank, and relevant public institutions. Then ask which later response the claim depends on. A claim about market yields needs a price mechanism and evidence. A claim about consumer spending needs an account of who spends the deposits and what suppliers can produce. This separates established bookkeeping from an economic hypothesis without treating either as a recommendation about whether purchases should occur.