ok i grant that devaluing money currency has gone on longer than 1971, but if chart went back to the days before central banking I'm betting you would see stable prices i was referring to. Fed was created in 1913.

By the end of 1778, Continental Currency retained only between 1/5 to 1/7 of its original face value. By 1780, Continental bills - or Continentals - were worth just 1/40th of their face value. Congress tried to reform the currency by removing the old bills from circulation and issuing new ones, but this met with little or no success. By May 1781, Continentals had become so worthless they ceased to circulate as money. Benjamin Franklin noted that the depreciation of the currency had, in effect, acted as a tax to pay for the war.[1] In the 1790s, after the ratification of the United States Constitution, Continentals could be exchanged for treasury bonds at 1% of face value.[2]

The Average Life Expectancy For A Fiat Currency Is 27 Years ...