Choose the year before choosing the conversion
The stock-market crash year, the 1933 price trough, and the late 1930s should not share one multiplier. Falling prices from 1929 into the early Depression meant one dollar bought more in price-index terms, but many households had fewer dollars because jobs, wages, and output collapsed.
Record the document date as closely as possible. Average prices differed greatly between a 1929 contract, a 1933 wage and a 1938 menu.
| Year | BLS annual CPI | Interpretive checkpoint |
|---|---|---|
| 1929 | 17.1 | Crash year; higher price level than 1933 |
| 1933 | 13.0 | Deep-Depression deflation low |
| 1938 | 14.1 | Prices partly recovered, still below 1929 |
A stronger dollar did not mean an easier life
A price comparison assumes someone actually had the money to spend. During the Great Depression, unemployment, bank failures, lost income, debt and regional differences shaped daily life. CPI alone cannot show those hardships.
Falling prices can also make a fixed debt harder to repay when income falls. A mortgage or business debt therefore needs more context than a simple 'what could $100 buy' comparison.
- Consumer prices: use CPI
- Joblessness and income: use labor and income figures
- Stocks or gold: use the relevant asset-price history
- A debt or judgment: check its legal terms and exact dates
Keep prewar product comparisons narrow
Products, quality, housing standards, household technology, and spending patterns changed substantially. The all-items CPI offers a common price-level baseline, not a promise that a 1930s automobile, medical service, or rent unit has a direct modern equivalent.
For a family record, present the CPI result first as an estimate in today’s money, then add a product-, wage-, or location-specific source only if the question calls for one.