Cos'è il Quantitative Easing? Come funziona e quali effetti ha sull'inflazione?

Il quantitative easing (QE) è uno strumento di politica monetaria utilizzato dalle banche centrali per stimolare l'economia acquistando grandi quantità di attività finanziarie. Può ridurre i tassi di interesse a lungo termine e sostenere i prestiti quando i tagli dei tassi convenzionali non sono più sufficienti. Ma come funziona il QE e significa semplicemente stampare più moneta?

Che cos'è il Quantitative Easing (QE)?

Il quantitative easing (QE) è una politica monetaria in cui una banca centrale acquista grandi quantità di titoli di Stato e altri strumenti finanziari per ridurre i costi di indebitamento a lungo termine e sostenere l'attività economica.

Negli Stati Uniti, la Federal Reserve acquista in genere titoli del Tesoro e titoli garantiti da mutui ipotecari emessi da agenzie governative (MBS). Questi acquisti aumentano le attività della Fed, incrementano le riserve del sistema bancario e contribuiscono a rendere le condizioni finanziarie più favorevoli per i prestiti e gli investimenti.

Il QE si differenzia dai tradizionali tagli dei tassi di interesse. Quando la Federal Reserve riduce il suo tasso di riferimento, influenza principalmente i costi di finanziamento a breve termine. Il QE agisce invece sui mercati finanziari, con l'obiettivo di ridurre i rendimenti a lungo termine che incidono sui mutui, sui finanziamenti alle imprese e su altri costi di finanziamento.

L'obiettivo non è semplicemente aumentare la quantità di denaro nel sistema finanziario, bensì incentivare la spesa e gli investimenti, sostenere l'occupazione e contribuire a stabilizzare l'economia durante i periodi di grave debolezza.

Come funziona il quantitative easing?

Il quantitative easing (QE) inizia quando la banca centrale acquista titoli finanziari dagli investitori attraverso il sistema finanziario. Queste transazioni aumentano la domanda per gli attivi acquistati e creano riserve bancarie aggiuntive.

Poiché i prezzi e i rendimenti delle obbligazioni si muovono in direzioni opposte, un aumento della domanda può spingere al rialzo i prezzi delle obbligazioni e al ribasso i rendimenti. Rendimenti più bassi possono quindi influenzare i tassi di interesse su altri prestiti nell'intera economia.

Il quantitative easing equivale a stampare moneta?

Non esattamente. Il quantitative easing crea moneta della banca centrale in formato elettronico, anziché richiedere la stampa di banconote fisiche.

Ad esempio, supponiamo che la Federal Reserve acquisti 100 miliardi di dollari in titoli del Tesoro. Il pagamento avviene tramite l'accredito di riserve nel sistema bancario. Se i titoli vengono acquistati da un investitore non bancario, quest'ultimo riceve in genere un deposito bancario, mentre la sua banca riceve riserve aggiuntive.

Ora la Federal Reserve detiene i titoli e il sistema bancario possiede maggiori riserve. Tuttavia, ciò non significa che 100 miliardi di dollari siano stati consegnati direttamente ai consumatori o alle imprese.

Le banche non aumentano automaticamente i prestiti solo perché dispongono di maggiori riserve. L'erogazione di prestiti dipende anche dalla domanda dei mutuatari, dalla loro solvibilità, dai requisiti patrimoniali e dalle condizioni economiche generali.

La distinzione fondamentale è questa: il quantitative easing crea moneta all'interno del sistema finanziario, ma la quantità di spesa aggiuntiva e di attività economica che ne consegue dipende da come reagiscono le istituzioni finanziarie, gli investitori e i mutuatari.

In che modo il quantitative easing influisce sui tassi di interesse e sui costi di finanziamento?

QE mainly influences longer-term interest rates by changing the supply of bonds available to private investors and increasing demand for those securities.

Consider a 10-year Treasury bond. When the Fed buys large quantities of similar securities, their market prices may rise and their yields fall. Lower Treasury yields can help reduce borrowing costs across other markets.

This can affect the economy in several ways:

• Mortgages: Lower long-term yields and purchases of mortgage-backed securities can help reduce mortgage rates.
• Business loans: Lower financing costs can encourage companies to invest and expand.
• Consumer spending: Cheaper borrowing and stronger asset prices may support household spending.

However, these effects are not guaranteed. Mortgage rates and business lending costs also depend on credit risks, lender margins, and market conditions. QE can lower borrowing costs without necessarily producing a strong increase in lending.

When Is Quantitative Easing Used?

Central banks generally turn to quantitative easing during severe economic downturns or financial market disruptions, particularly when short-term interest rates are already near zero.

Under normal conditions, cutting interest rates is usually a central bank's first response to slowing economic growth. But when rates are already extremely low, further cuts have limited room to provide additional stimulus.

QE offers another way to ease financial conditions by targeting longer-term interest rates and supporting the functioning of important bond markets.

Real-World Examples of Quantitative Easing

2008 Global Financial Crisis: Following the financial crisis, the Federal Reserve began large-scale asset purchases in November 2008. During its first round of QE, it eventually purchased $1.25 trillion in agency mortgage-backed securities, $300 billion in longer-term Treasury securities, and $175 billion in agency debt. These purchases aimed to support credit markets and lower longer-term borrowing costs.

2020 COVID-19 Pandemic: As the pandemic disrupted financial markets and economic activity, the Fed again launched large-scale purchases of Treasury securities and agency mortgage-backed securities. The immediate priority was to restore market functioning and maintain the flow of credit. The purchases also helped support accommodative financial conditions during the economic downturn.

Both examples show that QE is generally used when conventional monetary policy is insufficient or financial markets face extraordinary stress. Its effectiveness depends on the economic circumstances and how strongly lower borrowing costs translate into additional spending and investment.

For historical details, see the Federal Reserve Bank of New York's asset purchase records and the Congressional Budget Office's explanation of quantitative easing.

Does Quantitative Easing Cause Inflation?

Quantitative easing can increase inflation, but it does not automatically cause consumer prices to rise. Its impact depends on whether easier financial conditions translate into stronger spending and demand for goods and services.

When QE lowers borrowing costs, households may spend more and businesses may increase investment. If demand grows faster than the economy's ability to produce goods and services, prices can rise.

However, the relationship is not immediate or predictable. Inflation also depends on supply constraints, wages, government spending, energy prices, and inflation expectations.

Why Doesn't QE Always Lead to Higher Inflation?

The main reason is that creating bank reserves does not guarantee an equivalent increase in spending.

During a recession, businesses may avoid borrowing because they expect weak sales. Households may prioritize saving or repaying debt, even when interest rates are low.

For example, the Fed's QE programs after the 2008 financial crisis greatly expanded its balance sheet, yet U.S. inflation generally remained subdued for much of the following decade.

By contrast, inflation rose sharply after the pandemic, when monetary stimulus coincided with substantial fiscal support, supply-chain disruptions, and recovering consumer demand. QE contributed to accommodative financial conditions, but it was not the sole cause of rising prices.

The distinction is between creating money and generating spending. QE can support demand, but inflation depends on how that demand compares with available supply.

What Are the Benefits and Risks of Quantitative Easing?

The main benefit of QE is that it provides additional economic support when conventional interest rate cuts have limited room to work.

By reducing longer-term borrowing costs and improving financial market conditions, QE can help stabilize credit markets, encourage investment, and reduce the risk of a deeper recession.

However, its benefits are uneven. Financial markets may respond quickly to asset purchases, while improvements in employment, business investment, and household income can take much longer.

How Does QE Affect Stocks, Bonds, and Housing Prices?

QE can influence asset prices through lower bond yields, changes in investor demand, and expectations about future economic growth.

• Stocks: Lower bond yields can make equities more attractive relative to fixed-income investments. Lower financing costs may also support company valuations and earnings expectations.
• Bonds: Central bank purchases typically increase demand for targeted bonds, pushing their prices higher and yields lower.
• Housing: Lower mortgage rates can improve affordability for some buyers and increase housing demand, potentially putting upward pressure on home prices.

These effects are not guaranteed. Weak corporate earnings, high credit risks, or deteriorating economic conditions can outweigh the support QE provides.

Importantly, rising asset prices are not the same as consumer price inflation. QE may boost stock or housing valuations without producing a comparable increase in everyday prices.

What Are the Main Risks and Limitations of QE?

QE also creates several challenges for central banks and the broader economy:

• Wealth inequality: Rising stock and property prices may disproportionately benefit households that already own significant financial assets.
• Financial risk-taking: Persistently low yields can encourage investors to pursue riskier investments in search of higher returns.
• Limited economic impact: QE cannot directly fix weak consumer confidence, supply shortages, or structural problems that discourage business investment.
• Policy withdrawal: Reducing monetary support can be difficult if financial markets have become accustomed to low yields and abundant liquidity.

These limitations explain why QE is generally considered a supplementary monetary policy tool rather than a permanent solution to economic weakness.

Quantitative Easing vs. Quantitative Tightening

Quantitative easing (QE) expands a central bank's securities holdings to ease financial conditions, while quantitative tightening (QT) reduces those holdings to withdraw monetary accommodation.

QT usually involves allowing bonds to mature without fully reinvesting the proceeds, although central banks can also sell securities directly.

QE and QT are separate from conventional interest rate decisions. A central bank can adjust its benchmark rate while also managing the size of its balance sheet.

For example, the Federal Reserve began QT in June 2022 and ended that balance sheet runoff on December 1, 2025. Subsequent purchases aimed at maintaining adequate bank reserves are not necessarily QE, because their purpose is different from providing economic stimulus.

For further details, see the Federal Reserve's balance sheet normalization timeline.

Conclusion

Il quantitative easing aiuta le banche centrali a sostenere l'attività economica acquistando titoli e riducendo i costi di finanziamento a lungo termine. Può stabilizzare i mercati e incoraggiare gli investimenti, ma il suo impatto sull'inflazione dipende dalle condizioni economiche generali. Comprendere il QE insieme al quantitative tightening fornisce un quadro più chiaro di come le banche centrali influenzano i mercati finanziari e l'economia.