One thing that has puzzled me is that some of the countries that have — implicitly at least — been most critical of the expansion of the Fed’s balance sheet during the crisis long have had much larger balance sheets than the US Federal Reserve.
Before the crisis, the Fed’s balance sheet was around 6% of US GDP. Right now, it is around 15% of US GDP. A big increase no doubt. But the balance sheet of the People’s Bank of China (PBoC) is around 70% of China’s GDP. Foreign assets make up about 80% of the PBoC’s balance sheet — or around 55% of China’s GDP. And the PBoC’s estimated holdings of US treasuries and agencies are about equal to 30% of China’s GDP — a level that is far higher, relative to China’s GDP, than the US Fed is ever likely to achieve. The Fed expects its balance sheet to peak at roughly $2.5 trillion, or between 15% and 20% of US GDP.
China consequently presumably knows a thing or two about how to prevent rapid expansion of the central banks balance sheet — including rapid expansion from purchases of long-term US Treasuries and Agencies — from producing unwanted inflation.
The key, of course, is to sterilize the expansion of the central bank’s balance sheet. That means to offset the increase in the banks’ financial assets with an increase in the central banks’ financial liabilities, rather than increase in base money.*
Paul Swartz and Peter Tillman — my colleagues at the Council’s Center for Geoeconomic Studies — have plotted the growth in the balance sheet of the PBoC (relative to China’s GDP) and the growth in the Fed’s balance sheet (relative to US GDP). By China’s recent standards, the expansion of the Fed’s balance sheet isn’t particularly unusual.