Quantitative Easing (QE)

Quantitative easing is the purchase of large quantities of longer-term securities by a central bank, funded by creating reserves rather than by taxing or borrowing, in order to push down longer-term interest rates and make credit cheaper and more available. It is a substitute for the tool a central bank normally uses. The Federal Reserve's usual instrument is the target range for the federal funds rate, an overnight rate; once that range is close to zero, further cuts are largely unavailable, and the Committee's published strategy says it "is prepared to use its full range of tools to achieve its maximum employment and price stability goals, particularly if the federal funds rate is constrained by its effective lower bound." Buying long-dated bonds is the main one of those tools.

The naming is worth stating, because the official name and the popular name are different and the Federal Reserve uses both. In its own accounts of monetary policy the Board of Governors heads these programs "Large-Scale Asset Purchase Programs," and its public explainer, The Fed Explained, describes the tool as "large-scale asset purchases (sometimes known as quantitative easing)." A 2024 speech by Governor Christopher Waller on the reverse operation uses QE and QT throughout without qualification. So neither name is wrong. The documents describing what was actually bought head the section large-scale asset purchases, and the commentary about them says QE.

The mechanism is a balance-sheet swap, and getting this right dissolves most of what is confusing about it. When the Federal Reserve buys a Treasury bond or an agency mortgage-backed security, it credits the seller's bank with reserves held at the Federal Reserve. The central bank's assets rise by the securities and its liabilities rise by the reserves. No currency is printed, no appropriation is spent, and nothing is deposited in anybody's checking account. What has happened is that a long-dated bond has moved from private hands onto the central bank's books, and an overnight claim on the central bank has moved the other way.

The intended effect follows from that swap. With fewer long-dated bonds available to private buyers who want them, their prices rise and their yields fall, and other long-term borrowing costs priced off those yields fall with them. The Board describes the purpose of the 2008 through 2014 programs in those terms: it "greatly expanded its holding of longer-term securities through open market purchases with the goal of putting downward pressure on longer-term interest rates and thus supporting economic activity and job creation by making financial conditions more accommodative."

The household-facing channel is mortgages, and one of the purchases carries that purpose in the Board's own sentence. The first program the Board enumerates is $175 billion in direct obligations of Fannie Mae, Freddie Mac and the Federal Home Loan Banks, bought between December 2008 and August 2010, and the reason sits inside the sentence that reports it: the Federal Reserve made those purchases "to help reduce the cost and increase the availability of credit for the purchase of houses." The Board then records, without restating a purpose, a further $1.25 trillion in mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac and Ginnie Mae between January 2009 and August 2010, which is the largest single program on the list. Both bought housing-related paper, so the tool was not aimed only at abstract financial conditions; one of its two main targets was the mortgage market a household actually borrows in.

Quantitative tightening is the reverse, and it usually works by not reinvesting rather than by selling. In October 2017 the Committee began a balance sheet normalization program that, in the Board's description, "gradually reduced the Federal Reserve's securities holdings by decreasing its reinvestment of principal payments received from securities held in the SOMA." When a bond the central bank owns matures, it is simply not replaced, and the balance sheet shrinks passively. That distinction matters because a program of outright sales into the market would be a much sharper intervention than letting holdings run off.

Two honest complications, both from Federal Reserve sources. The first is the relationship between the two directions. Governor Christopher Waller argued in a March 2024 speech that "it is very important that QE be credibly followed by QT," reasoning that if the purchases were "viewed as nothing more than a permanent injection of money into the economy, it would likely create inflation," and that the widely predicted inflation after 2009 did not arrive, in his view, because "the Fed credibly committed to withdrawing the injected reserves at a later date." That is one governor's assessment rather than a Committee position, and it is the clearest available statement of why the two operations are treated as a pair.

The second is that shrinking the balance sheet has its own limit. Waller described the money-market stresses of autumn 2019, when reserves had been reduced through the normalization program and heavy Treasury issuance arrived in September, and concluded that "the level of reserves likely went a bit too low." Reducing the balance sheet is not simply undoing the purchases; it runs into the banking system's own demand for reserves.

The sequence, as the Board's own record describes it for the 2008 through 2014 programs.

1. The short-term tool runs out of room. The Board notes that its approach to implementing monetary policy changed considerably after the financial crisis, "and particularly so since late 2008 when the FOMC established a near-zero target range for the federal funds rate."

2. The Committee authorizes purchases of longer-term securities. Announcements name a quantity, a type of security and a window. The programs the Board enumerates ran as follows: $175 billion of agency direct obligations from December 2008 to August 2010; $1.25 trillion of agency mortgage-backed securities from January 2009 to August 2010; $300 billion of longer-term Treasury securities from March to October 2009; a further $600 billion of longer-term Treasuries from November 2010 to June 2011; then monthly-pace purchases of $40 billion of mortgage-backed securities from September 2012 and $45 billion of longer-term Treasuries from January 2013.

3. The Trading Desk buys in the open market, which is a statutory requirement rather than a convention. Section 14(b) of the Federal Reserve Act, codified at 12 U.S.C. 355, allows a Reserve Bank to buy and sell direct obligations of the United States "without regard to maturities but only in the open market," and agency obligations likewise "in the open market." So the securities are bought from existing holders, not from the Treasury, and quantitative easing is not a central bank lending directly to the government. These are permanent open market operations, and the Board notes that each one affects its balance sheet, with the size and nature of the effect depending on the specifics of the operation. That balance sheet is published every week in the H.4.1 statistical release.

4. Purchases slow, then stop. The Board reduced the pace "in measured steps" from December 2013 and "concluded the purchases in October 2014."

5. The balance sheet is normalized. From October 2017 the Committee reduced holdings by decreasing reinvestment of principal payments, so the balance sheet shrank as securities matured.

A hypothetical example of why the mortgage channel is worth the trouble. Take a $300,000 30-year fixed-rate mortgage. At 6.5 percent the monthly principal-and-interest payment is about $1,896. At 6.0 percent it is about $1,799. Half a percentage point is therefore worth roughly $98 a month to that borrower, and about $35,000 over the full 360 payments. Nothing here implies that any particular purchase program moved mortgage rates by any particular amount, and no such claim should be read into it. The point is only the arithmetic of the channel the Board named when it explained why it was buying agency housing debt rather than Treasuries alone.

The case for the tool

• It gives a central bank something to do when the short-term rate is at its lower bound, which is exactly when the economy most needs easing and the usual instrument is spent.
• It works directly on long-term rates, which are the rates that price mortgages and corporate borrowing, rather than relying on the short rate to pull them along.
• The mortgage channel is targeted. Buying agency debt and agency mortgage-backed securities acts on housing credit specifically, and the Board's stated reason for the agency-debt purchases was the cost and availability of credit for buying houses.
• It requires no legislation, so it can be deployed on the timetable of a policy meeting.

The objections and the limits

• Its size and effects are genuinely disputed among economists, so how much a given program moved long-term rates is not a settled number.
• It works by raising the prices of financial assets, which are unevenly held, so the immediate benefit is not distributed the way a tax cut or a transfer would be.
• Unwinding it has its own limit. Governor Waller's account of autumn 2019 is that reserves were reduced too far and money markets showed strain.
• The balance sheet does not shrink quickly when the method is to stop reinvesting maturing bonds, so the position taken during an easing episode persists for years.
• It is easy to misdescribe as printing money, which invites conclusions about inflation that the mechanism does not support on its own terms.