What Held Its Value When Inflation Jumped: A Long-Term View of Traditional Assets
Inflation remains a concern, even as October's monthly increase slowed from September. Consumer prices rose 0.4% in October after seasonal adjustment, following 0.6% in September, the Bureau of Labor Statistics reported on November 10. The BLS could not publish a 12-month rate for October because the 2025 government shutdown halted its price collection a year earlier. The latest available 12-month rate, for September, was 3.7%, up from 3.0% a year before. Clients who lived through 2021 and 2022 remember how fast rising prices ate into their savings. Many will ask: what protects a portfolio when inflation picks up?
The last COVID-era episode alone is a thin basis for an answer, so we went back to the start of the government's consumer price index in 1913. This gives December-to-December inflation for every year from 1914 through 2025. We flagged years when inflation jumped: a rate at least 1.5 percentage points above the prior year's and at least 3%. Seventeen of the 111 years from 1915 through 2025 meet that bar. For each of the seventeen, we measured what U.S. stocks (the S&P 500 and its predecessor index, dividends included), 10-year government bonds and cash (three-month Treasury bills, and commercial paper before 1934) earned after inflation. The early bond and cash figures rest on stand-ins: Robert Shiller's bond series uses older long-term yields, including municipal bonds, before modern Treasury data, and commercial paper carries credit risk.
Many of the early jumps occurred around wars and their aftermath: 1916 to 1918, 1941, 1946 and 1950, with 1925 the exception. They returned in 1966 and 1968, ran through the 1970s (1973, 1974 and 1977 to 1979), and appeared three more times, in 1987, 2007 and 2021. Whether 2026 joins the list will not be clear until December's figures are released. By our yardstick, inflation would need to end the year at 4.18% or more, 1.5 percentage points above 2025's 2.68%. Through October, prices were up 4.15% from December 2025, just under that bar and above the looser 1-percentage-point bar of 3.68%. November and December will determine whether 2026 meets the threshold.
When Inflation Jumped: Stocks, Bonds and Cash Fell Behind
In the seventeen years when inflation jumped, none of the three asset classes kept its purchasing power on average during that year. Stocks lost 4.8% after inflation, bonds 6.9% and cash 4.2%. In an average year over the whole period, by contrast, stocks gained 8.9% after inflation, bonds 2.0% and cash 0.7%.
Bonds fared worst in this sample. They beat inflation in only two of the seventeen years (1925 and 2007), and the median year cost bondholders 8.6% of their purchasing power. A conventional fixed-rate bond pays a fixed number of dollars per coupon, so each payment buys less when inflation rises. If investors also demand higher yields on new bonds, existing bond prices fall, adding to the loss.
Cash held up better than bonds but still lost ground in twelve of the seventeen years. Short-term interest rates can follow inflation higher with a lag, leaving savers behind when prices rise quickly. In 1946, when wartime price controls ended, prices rose 18.1% while Treasury bills earned less than half a percent. That year cash lost 15.0% of its value after inflation.
Of the three major asset classes, stocks had the widest range of outcomes in the selected inflation-jump years. They beat inflation in seven of the seventeen years. In 1917, the year the United States entered the First World War, stocks lost 37% after inflation. In 1974 they lost 34%. Yet they gained 25% in 1925, 21% in 1950 and 20% in 2021.
Some companies can raise prices over time, which can help offset inflation. Stocks outpaced inflation over the full historical period studied, but that does not ensure they will do so over an investor's holding period. Within a single year, higher costs and higher interest rates can squeeze profits and valuations. Results depend on economic conditions, pricing power and corporate balance sheets.
Gold has a shorter track record in our study. In August 1971, the United States suspended foreign official dollar convertibility into gold. This study begins its gold comparison in 1972, leaving eight of the inflation-jump years. Gold gained an average of 33% after inflation in those years and beat inflation in seven, while over the same years stocks lost 6.1%, bonds 6.5% and cash 1.8%. Five of the eight observations came in the 1970s, so the average is heavily influenced by that decade and should not be treated as evidence of a dependable inflation hedge. In 2021, gold lost 10% after inflation. From 1972 through 2025, gold compounded at 4.8% a year after inflation, against 7.0% for stocks. Gold can be volatile and does not generate income.
Treasury Inflation-Protected Securities (TIPS), first auctioned in 1997, are excluded from this century-long comparison. Their shorter history does not support the same sample of inflation episodes, and this study does not establish how they would compare. TIPS principal adjusts with CPI, but their market prices can fall as real interest rates rise.
The Year After, and the Long Run
The damage from an inflation spike did not reliably reverse the following year in this study. In the year after an inflation jump, stocks were roughly flat on average (down 1.2% after inflation). Bonds lost another 6.3% and cash gave back 3.1%. These selected historical observations do not establish what will happen after the next inflation spike.
The pattern did not hinge on our cutoff. A looser 1-percentage-point bar flags twenty inflation spikes, and a stricter 2-percentage-point bar identifies thirteen. Under either definition, all three asset classes lost value after inflation on average. Bonds did worst, beating inflation in only four of twenty years and one of thirteen. These alternative thresholds test the sensitivity of this sample; they do not capture every possible definition or inflation environment.
The long record also shows why one bad year is not the whole story. Over all 112 years from 1914 through 2025, stocks compounded at about 7.1% a year after inflation, bonds 1.6% and cash 0.6%. Stocks' long-run advantage reflects the full period, including years outside the selected inflation jumps. Stocks have not provided reliable protection against inflation over a single year and can suffer substantial, prolonged losses. Their role depends on an investor's time horizon, spending needs and ability to bear risk.
What the Record Suggests
For advisors, the history offers a few ways to think about a client's plan. One step is setting expectations: stocks, bonds and cash each lost purchasing power in most of the selected inflation-jump years, and none consistently preserved it across those years. Another is considering how near-term spending is funded. Money a client needs in the next year or two is exposed to inflation wherever it sits. Although bonds fell behind inflation in more of the selected years than stocks or cash, this does not make stocks a suitable substitute for near-term spending reserves; their market losses can be much larger. A third is distinguishing long-term purchasing-power goals from short-term capital stability. Stocks provided the strongest long-run real return among the three asset classes studied, alongside substantial risk.
A single inflation report like October's 0.4% rise says little about what a portfolio will earn after inflation over an investor's full horizon. Across more than a century of data, stocks, bonds and cash tended to lose ground in the selected years when inflation jumped. In Modelist's view, these findings support setting portfolio rules around an investor's goals and spending needs rather than reacting to each inflation release. A disciplined plan can still lose value and may need to change as circumstances change.
Study Notes
Historical study period: 1914-2025; inflation-jump selection period: 1915-2025, to permit comparison with the prior year. Inflation is measured December to December. The main selection requires inflation of at least 3% and an increase of at least 1.5 percentage points from the prior year; sensitivity comparisons use 1- and 2-percentage-point increases. Gold comparisons begin in 1972. Annual averages and compound annual returns describe different measures and should not be interpreted interchangeably. Results refer to historical asset-class series and proxies, rather than a blended portfolio. Early proxy data, different observation periods and changes in market structure limit comparisons. The analysis covers selected U.S. assets and does not evaluate every potential inflation-sensitive investment.
Sources identified in the study: U.S. Bureau of Labor Statistics consumer price data; S&P 500 and predecessor equity history; Robert Shiller historical bond series; Treasury-bill and pre-1934 commercial-paper history. Historical analysis by Modelist Inc. Current inflation discussion reflects the November 10, 2026 release; historical return observations end in 2025.
Important Information
This material is provided by Modelist Inc. for general informational and educational purposes and is not personalized investment advice. Views are as of November 10, 2026 and may change. Historical asset-class returns and proxies do not represent Modelist or client-account performance or predict future results. Results depend on the periods, data and inflation thresholds selected; the study's limitations are described above. Investors cannot invest directly in an index, and implementation costs, fees and taxes affect realized returns. Investing involves risk, including loss of principal. Past performance does not guarantee future results.
Modelist Inc. is a registered investment adviser. Registration does not imply a certain level of skill or training. Additional information about Modelist, including its Form ADV Part 2A, is available upon request or at www.adviserinfo.sec.gov
