Value of $100 in 1917, adjusted to 2020

What happened to prices between 1917 and 2020

Between 1917 and 2020, the Consumer Price Index went from 12.8 to 258.811. Cumulatively, prices increased 1922.0%, which works out to an average of 2.96% per year. Put differently, a dollar in 1917 bought what $0.05 buys in 2020.

1917 is when World War I inflation stopped being a background trend and became the dominant fact of American economic life. Consumer prices rose 17.4% for the year, more than double the previous year’s already sharp increase, as the country’s April 6 entry into the war layered federal war spending on top of an economy already strained by military demand and worker shortages. Congress paid for the war with the War Revenue Act that October, which sharply raised income taxes, created a new tax on wartime business profits, and, in a small but very visible change for ordinary households, raised the cost of a first-class stamp from 2 cents to 3 cents that November, the rate’s first move since 1885. Herbert Hoover took over the new Food Administration in August and asked Americans to conserve food voluntarily rather than face formal rationing, a campaign that became famous enough that “Hooverize” entered the language as a verb for cutting back. None of it slowed prices much: the 17.4% increase would be topped again the very next year, in 1918.

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The destination year: 2020

2020 was the year the pandemic rewired the price data without triggering the inflation spike that followed it. Consumer prices rose just 1.2% for the year, the mildest pace since 2015, as COVID-19 lockdowns emptied roads, closed airports, and crushed energy demand. Oil told the starkest story: on April 20, U.S. crude futures fell to about negative $37 a barrel, the first negative settlement in the market’s history, as storage capacity ran out and no one wanted the physical barrels. Gasoline followed it down, falling to about $1.80 a gallon nationally that month before recovering to average $2.17 for the year. Grocery prices moved the other way: pantry stocking and meatpacking-plant disruptions pushed food-at-home costs up faster than usual, a rare case of food and energy pulling the index in opposite directions. Washington answered with the $2.2 trillion CARES Act, signed March 27, which sent $1,200 payments to most adults and added $600 a week to unemployment benefits as states ordered widespread business closures. The Federal Reserve cut its policy rate to near zero in two emergency moves that same month and pledged to buy Treasury and mortgage bonds “in the amounts needed” to keep credit markets working, an open-ended commitment beyond even its 2008 response. None of it showed up in the CPI yet: the stimulus, the supply shocks, and the reopening whiplash that followed would build into the fastest inflation in four decades over the next two years.

More about inflation in 2020 →