Lance Roberts of RIA Advisors believes investors are underestimating a risk that has appeared more than once throughout market history. Speaking on a recent episode of Thoughtful Money with Adam Taggart, Roberts delivered a stark warning: “We will get into a lost decade again. That’s almost a guarantee.”
Roberts’ argument is not that a crash is imminent. The S&P 500 has gained more than 28% over the past year, while the CBOE Volatility Index, or VIX, sits near levels typically associated with investor confidence and market calm. His concern is that today’s strong returns may be pulling future returns forward, creating conditions that could lead to years of disappointing performance down the road.
What a Lost Decade Actually Looks Like
A lost decade does not necessarily mean markets collapse. It means investors spend years earning little or no real return after inflation.
The most recent example occurred between 2000 and 2010. Using the SPDR S&P 500 ETF Trust (NYSEARCA:SPY) as a proxy for the S&P 500, the index moved from $145.44 on January 3, 2000, to $125.75 on December 31, 2010, which was a price change of -13.54% before dividends. That decade included two roughly 50% drawdowns, which were the dot-com crash and the financial crisis, and tested the patience of every buy-and-hold investor who lived through it.
Today’s environment looks very different on the surface. Corporate profits remain strong. According to Bureau of Economic Analysis data, U.S. corporate profits reached approximately $4.39 trillion during the first quarter of 2026, up 12% year over year. SPY has gained 260.5% over the past ten years and 80.1% over the past five, with another 10.93% year to date.
Why Roberts Thinks Returns Could Slow
Roberts’ thesis centers on a few familiar concerns. The first is valuation. Stocks are trading at elevated levels relative to many historical measures, a point echoed by several major Wall Street firms. Goldman Sachs, in its 2026 Investment Outlook, makes a related point, noting that “valuations are high in both public and private markets,” even as it argues earnings growth has so far supported the multiples.
The second is concentration. A relatively small number of mega-cap technology companies have driven a significant share of recent market gains. If market leadership narrows further or earnings growth slows, the broader market could become more vulnerable.
The third is simple mean reversion. Periods of unusually strong returns have often been followed by periods of weaker returns.
The current interest-rate environment adds another layer to the discussion. The 10-year Treasury yield recently stood near 4.45%, providing investors with a risk-free alternative that was largely absent during the ultra-low-rate era.
Taggart’s Tough-Love Pivot
Host Adam Taggart expanded on the idea by shifting the discussion toward personal responsibility. “You have two choices, which is one, I can blame others for my situation, or I can take responsibility for my situation,” Taggart said. “Has anything ever gotten better in your life by blaming others for your situation?”
He also pointed to a lesson many investors learned during the 2008 financial crisis.
“People that got devastated during the financial crisis weren’t prepared for it to start with. People that survived it were financially prepared for it to start with.” The point was the importance of building enough flexibility into a financial plan to withstand them.
What to Watch Next
Roberts is offering a view that now is a good time to assess your portfolio risk, diversification, and cash buffer.
Whether a lost decade actually arrives remains to be seen. What investors can control today is how prepared they are if it does.
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