The Federal Reserve's balance sheet has undergone significant changes since 2007, reflecting its response to major economic crises. From a modest 0.9 trillion U.S. dollars at the end of 2007, it ballooned to approximately 6.76 trillion U.S. dollars by March 2025. This dramatic expansion, particularly during the 2008 financial crisis and the COVID-19 pandemic - both of which resulted in negative annual GDP growth in the U.S. - showcases the Fed's crucial role in stabilizing the economy through expansionary monetary policies. Impact on inflation and interest rates The Fed's expansionary measures, while aimed at stimulating economic growth, have had notable effects on inflation and interest rates. Following the quantitative easing in 2020, inflation in the United States reached eight percent in 2022, the highest since 1991. However, by November 2024, inflation had declined to 2.7 percent. Concurrently, the Federal Reserve implemented a series of interest rate hikes, with the rate peaking at 5.33 percent in August 2023, before the first rate cut since September 2021 occurred in September 2024. Financial implications for the Federal Reserve The expansion of the Fed's balance sheet and subsequent interest rate hikes have had significant financial implications. In 2023, the Fed reported a negative net income of 114.3 billion U.S. dollars, a stark contrast to the 58.84 billion U.S. dollars profit in 2022. This unprecedented shift was primarily due to rapidly rising interest rates, which caused the Fed's interest expenses to soar to over 281 billion U.S. dollars in 2023. Despite this, the Fed's net interest income on securities acquired through open market operations reached a record high of 174.53 billion U.S. dollars in the same year.

As of December 2024, Japan held United States treasury securities totaling about 1.06 trillion U.S. dollars. Foreign holders of United States treasury debt According to the Federal Reserve and U.S. Department of the Treasury, foreign countries held a total of 8.5 trillion U.S. dollars in U.S. treasury securities as of December 2024. Of the total held by foreign countries, Japan and Mainland China held the greatest portions, with China holding 759 billion U.S. dollars in U.S. securities. The U.S. public debt In 2023, the United States had a total public national debt of 33.2 trillion U.S. dollars, an amount that has been rising steadily, particularly since 2008. In 2023, the total interest expense on debt held by the public of the United States reached 678 billion U.S. dollars, while 197 billion U.S. dollars in interest expense were intra governmental debt holdings. Total outlays of the U.S. government were 6.1 trillion U.S. dollars in 2023. By 2029, spending is projected to reach 8.3 trillion U.S. dollars.

The Federal Reserve's balance sheet ballooned following its announcement to carry out quantitative easing to increase the liquidity of U.S. banks in early 2020. The balance sheet continued to grow in the following period as well, with a downward trend in 2023. As of February 29, 2024, the Fed's balance sheet amounted to roughly 7.6 trillion U.S. dollars. The most drastic increase in the observed period took place in the first half of 2020. This measure was taken to increase the money supply and stimulate economic growth in the wake of the damage caused by the COVID-19 pandemic. The Federal Reserve was not the only institution that implemented an expansionary monetary policy in response to the pandemic. For instance, the European Central Bank expanded its money supply in March 2020 and kept doing so over the following months. How do central banks increase the amount of money in circulation? Central banks can increase the money circulating in the economy in many ways. For instance, they can decrease banks’ reserve requirements to stimulate lending or decrease the interest rates to reduce the cost of borrowing for commercial banks. Alternatively, central banks can engage in open market operations (OMO) and buy securities such as government bonds from commercial banks or institutions. By conducting open market operations, the Federal Reserve expanded its balance sheet by seven trillion U.S. dollars between 2007 and 2023. All these measures aim to increase bank loans to entrepreneurs and consumers in order to stimulate employment and economic growth. Impact of COVID-19 on the U.S. economy The COVID-19 pandemic had a tremendous impact on national economies worldwide, and the United States was no exception. During the early months of the crisis, many lost their jobs, mostly those in lower-income categories. As a consequence, many Americans found it difficult to pay their rent and cover basic household expenses. Furthermore, in April 2022, most small business owners claimed that the pandemic had a large or moderate negative effect on their businesses. Overall, the gross domestic product (GDP) of the United States decreased by roughly 2.2 percent in 2020. In the following years, however, it increased notably, surpassing 25 trillion U.S. dollars in 2022.

The Global Financial Crisis of 2008-09 was a period of severe macroeconomic instability for the United States and the global economy more generally. The crisis was precipitated by the collapse of a number of financial institutions who were deeply involved in the U.S. mortgage market and associated credit markets. Beginning in the Summer of 2007, a number of banks began to report issues with increasing mortgage delinquencies and the problem of not being able to accurately price derivatives contracts which were based on bundles of these U.S. residential mortgages. By the end of 2008, U.S. financial institutions had begun to fail due to their exposure to the housing market, leading to one of the deepest recessions in the history of the United States and to extensive government bailouts of the financial sector.

Subprime and the collapse of the U.S. mortgage market

The early 2000s had seen explosive growth in the U.S. mortgage market, as credit became cheaper due to the Federal Reserve's decision to lower interest rates in the aftermath of the 2001 'Dot Com' Crash, as well as because of the increasing globalization of financial flows which directed funds into U.S. financial markets. Lower mortgage rates gave incentive to financial institutions to begin lending to riskier borrowers, using so-called 'subprime' loans. These were loans to borrowers with poor credit scores, who would not have met the requirements for a conventional mortgage loan. In order to hedge against the risk of these riskier loans, financial institutions began to use complex financial instruments known as derivatives, which bundled mortgage loans together and allowed the risk of default to be sold on to willing investors. This practice was supposed to remove the risk from these loans, by effectively allowing credit institutions to buy insurance against delinquencies. Due to the fraudulent practices of credit ratings agencies, however, the price of these contacts did not reflect the real risk of the loans involved. As the reality of the inability of the borrowers to repay began to kick in during 2007, the financial markets which traded these derivatives came under increasing stress and eventually led to a 'sudden stop' in trading and credit intermediation during 2008.

Market Panic and The Great Recession

As borrowers failed to make repayments, this had a knock-on effect among financial institutions who were highly leveraged with financial instruments based on the mortgage market. Lehman Brothers, one of the world's largest investment banks, failed on September 15th 2008, causing widespread panic in financial markets. Due to the fear of an unprecedented collapse in the financial sector which would have untold consequences for the wider economy, the U.S. government and central bank, The Fed, intervened the following day to bailout the United States' largest insurance company, AIG, and to backstop financial markets. The crisis prompted a deep recession, known colloquially as The Great Recession, drawing parallels between this period and The Great Depression. The collapse of credit intermediation in the economy lead to further issues in the real economy, as business were increasingly unable to pay back loans and were forced to lay off staff, driving unemployment to a high of almost 10 percent in 2010. While there has been criticism of the U.S. government's actions to bailout the financial institutions involved, the actions of the government and the Fed are seen by many as having prevented the crisis from spiraling into a depression of the magnitude of The Great Depression.