Value of $100 in 1923, adjusted to 1929

What happened to prices between 1923 and 1929

Between 1923 and 1929, the Consumer Price Index went from 17.1 to 17.1. Cumulatively, prices increased 0.0%, which works out to an average of 0.00% per year. Put differently, a dollar in 1923 bought what $1.00 buys in 1929.

Consumer prices rose 1.8% in 1923, the first increase since 1920 and a sign the postwar deflation had run its course; the economy settled into the steadier growth that defined much of the rest of the decade. The year’s biggest shock was political rather than economic: Warren Harding died August 2 in San Francisco while returning from a trip to Alaska, and Vice President Calvin Coolidge was sworn in the next day at his family’s farmhouse in Plymouth Notch, Vermont, administered the oath of office by his own father, a notary public, by lamplight. Coolidge would go on to preside over the low, stable inflation of the “Roaring Twenties.” The contrast with Germany that year was stark. The Weimar Republic’s currency collapse reached its peak in November 1923, with prices doubling every few days and a loaf of bread costing billions of marks; Germany introduced a new currency, the Rentenmark, that month to halt the spiral. U.S. consumer prices, by comparison, had moved in single digits or held flat every year since 1921, a gap that shaped how American economists would later think about what made the postwar inflation of Europe so different from the mild swings at home. First-class postage stayed at 2 cents.

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The destination year: 1929

Consumer prices were unchanged in 1929, the CPI’s annual average flat for the second time in six years and a fitting close to a decade that began with wartime inflation and ended in rough price stability. By year’s end the index stood 14.5% below its 1920 peak and roughly 73% above its 1913 starting point, a reminder that even a “stable” decade left prices well above where they had started. The stability in the cost of living masked what was building in financial markets. The National Bureau of Economic Research dates the start of the Great Depression to that August, the month the business cycle peaked, months before most Americans noticed anything was wrong. The break came that October: panic selling hit Wall Street on Black Thursday, October 24, and returned even worse on Black Tuesday, October 29, when the Dow Jones Industrial Average fell about 12% in a single session. Billions of dollars in paper wealth disappeared within days, and the crash marked the start of a downturn that would pull consumer prices into their steepest sustained decline of the 20th century over the next four years. First-class postage was still 2 cents, a price that would hold until 1932.

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