U.S. wholesale prices rise at fastest pace since 2009, PPI shows, as inflation pressures keep ...

[Deminpenn]

5. Inflation isn't a concern for the Federal Reserve, though

The Fed wants inflation of about 2-3% per year. It hasn't approached that figure for years now.

I doubt any of this was unexpected by economists. After all, the downturn was almost entirely due to everything being shut down for most of the last year by policy. A good comparison would be the pent up demand after WWII. There could also be a similar situation where the US economy is running at full speed while the rest of world's economies still are re-opening.