Tweet is referring to the PCE index, % change from the preceding month. Inflation is normally assessed annually (12 months) however, & the Fed’s PCE goal is 2%. It is currently 3%
Too much inflation suggests that an economy is facing serious troubles—but negative inflation, otherwise known as deflation, is an even bigger problem.
There are certainly other factors at play, but heavy use of c-sections allows for a larger brain, as brain size has historically been limited by birth canal diameter