Here is a useful chart for your collection;
View attachment 953120
The obvious boost in retail sales coincides with the rise in inflation and with
the government sending checks directly to people.
The surge in inflation directly resulted from the supply-to-demand imbalance caused by shutting down the economy
(supply) and increasing household purchasing power by sending them checks
(demand).
Savings accounts rocketed up
, and people went out and spent the money.
So, as usual, government policy is the source of inflation. Locking down the economy was colossaly stupid, but then sending everyone money while goods and services were artificially restricted was epic malfeasance.