Historical precedent shows the S&P 500 lost 40% in real terms during a 14-year inflationary period starting in 1968.
The S&P 500, trading at $745.64 as of May 22, 2026, has surged 28% over the past year, but historical patterns suggest a potential prolonged downturn. From 1968 to 1982, the index delivered zero nominal returns while losing 40% in real terms due to inflation eroding purchasing power over 14 years.
This period, often cited as a secular bear market, highlights the risk of stagnant equity performance amid high inflation. The index remained flat for nearly two presidential terms, underscoring the opportunity cost of lost compounding during such stretches.
While current valuations appear stretched, the precedent raises concerns about a repeat scenario where nominal gains mask significant real-term losses over an extended horizon.