The Federal Reserve building in Washington.

In the course of December and January, the balance sheet of the U.S. Federal Reserve (Fed) expanded by $186.7 billion to a total of $4.02 trillion. That policy reversal came after an impressive $244.6 billion liquidity withdrawal between August and November of last year.

Interestingly, the Fed's apparently puzzling return to aggressive asset purchases continued in an environment of mounting concerns about much-feared and presumably fast-approaching interest rate increases in the United States.