In this article, we examine the research on investing during inflationary regimes such as deflation, inflation, and stagflation. Factors perform relatively well in all regimes on a real basis.

Investing in Deflation, Inflation, and Stagflation Regimes

  • Baltussen, Swinkels and Pim van Vliet
  • Working paper, 2022
  • A version of this paper can be found here
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What are the Research Questions?

Spikes in inflation and fear of stagflation prompted this study which answers the following question:

1. How do risk premiums and investment strategies behave across inflationary regimes like periods of high inflation, deflation, or stagflation?

What are the Academic Insights?

By utilizing the deepest sample available for a relatively broad cross-section of asset class and factor portfolio starting in 1875 (147 years sample) and by analyzing four different regimes (1) below 0%, or deflation, (2) between 0% and the current central bank target of 2%, (3) a mild inflation overshoot, between 2% and 4%, and (4) high inflation, above 4%, the authors find the following:

1. The global equity return has been, on average, 8.4% (in arithmetic terms) between 1875 and 2021, while the global bond market return (currency risk hedged) has been 4.5%. In comparison, global inflation has been on average 3.2% per annum over the same period. Value, Momentum, Low risk or Quality/Carry factors also returned attractive and significant returns above 4%, with the average multi-factor combination delivering significant alphas on top of asset returns with t-values above 7.9 over this full sample period.

2. Equity, bonds, and global factor premiums are generally consistently positive across inflationary regimes, generally displaying no significant variation across. At the same time, they enhance nominal and real asset class returns in (approximated) long-only asset class implementations. Further, equity returns tend to be relatively low in nominal terms in periods of deflation but average in real terms. Equities and bonds on average yield lower nominal returns during periods of high inflation, causing negative real returns. These results are robust across different definitions of inflationary regimes, including a 3% or 5% (instead of 4%) high inflation cutoff, the use of annual changes in inflation (or unexpected inflation), the use of only U.S. (instead of global) inflation, or the use of 3-years (instead of 1-year) horizons

3. Periods of stagflation are truly bad times. For example, nominal equity returns average -7.1% per annum, yielding double-digit negative returns in real terms. During the bad times, equity, bond, and global factor premiums remain consistently positive. As such, factors help to offset some, but not all, of the negative impact of high inflation in recessionary times

The authors further study the terrible times and analyze the following sub-regimes: (1) recession or
expansion, (2) falling or rising earnings growth, (3) bear or bull equity markets, and (4) increasing
or decreasing interest rates, and (5) increasing or decreasing inflation. The findings are summarized in Table 4 below.

Why does it matter?

First, for investors, times of high inflation (and especially stagflation and inflationary) bear markets are challenging, which suggests asset class returns may partly provide compensation for bearing risks during these bad times.

Second, as equity, bond, and global factor premiums are generally consistent across inflationary regimes, they provide consistent value add for traditional portfolios. These premiums provide diversification but, at the same time, are also not a perfect hedge against inflation, as their returns do not substantially increase during the worst times.

Finally, our results suggest factor premiums in equities, bonds, and across asset classes are not compensation for bearing inflationary risks.

The Most Important Chart from the Paper:

The results are hypothetical results and are NOT an indicator of future results and do NOT represent returns that any investor actually attained.  Indexes are unmanaged and do not reflect management or trading fees, and one cannot invest directly in an index.


We examine asset class and factor premiums across inflationary regimes. As periods of high inflation and deflation are relatively uncommon in recent history, we use a deep sample starting in 1875. Moderate inflation scenarios provide the highest returns across asset class and factor premiums. During deflationary periods, nominal returns are low, but real returns are attractive. By contrast, real equity and bond returns are negative during a high inflation regime, and especially so during times of stagflation. During these ‘bad times’ factor premiums are positive, which helps to offset part of the real capital losses.

Elisabetta Basilico, PhD, CFA
Dr. Elisabetta Basilico is a seasoned investment professional with an expertise in "turning academic insights into investment strategies." Research is her life's work and by combing her scientific grounding in quantitative investment management with a pragmatic approach to business challenges, she’s helped several institutional investors achieve stable returns from their global wealth portfolios. Her expertise spans from asset allocation to active quantitative investment strategies. Holder of the Charter Financial Analyst since 2007 and a PhD from the University of St. Gallen in Switzerland, she has experience in teaching and research at various international universities and co-author of articles published in peer-reviewed journals. She and co-author Tommi Johnsen published a book on research-backed investment ideas, titled Smarte(er) Investing. How Academic Insights Propel the Savvy Investor. You can find additional information at Academic Insights on Investing.