Bitcoin has a higher inflation rate than USD.
Bitcoin inflation rate per annum: 3.87%
USD Current inflation rate for the United States is 2.7%.
Early in Bitcoin history, by design Bitcoin went though a period of hyperinflation where Satoshi and a few users acquired most of the coins in circulation.Aprox 4.11% of Bitcoin users (addresses) control 96.53% of all bitcoins in circulation.
Inflation is not calculated the way you think it is calculated.
After all if deflationary currency is worth more tomorrow, one wants to make sure an investment in the future is sustainable.
Notably one is especially interested to invest in a deflationary economy because the gains are multiplicative.