How NOT to Invest, with Barry Ritholtz

What It Covers

Barry Ritholtz, founder of Ritholtz Wealth Management, explains common investing mistakes across three categories: bad ideas, bad numbers, and bad behavior. He predicted the 2008 crisis and shares strategies for avoiding portfolio-destroying errors.

Key Questions Answered

• •Stock picking futility: Research from Henry Bessenbinder at Arizona State University shows only 2% of stocks create all market value. Rather than attempting to identify winners from 3,500 publicly traded companies, investors should use broad market index funds that self-adjust by market capitalization to capture returns.
• •Process over outcomes: Evaluate investment decisions based on sound methodology, not results. A statistically correct fourth-down conversion that fails remains the right call. Avoid outcome bias by thinking probabilistically about ranges of possibilities rather than making binary predictions about market direction or timing.
• •Emotional control determines success: Neurologist William Bernstein identifies managing the amygdala's fight-or-flight response as critical to investment success. Risk aversion makes losses feel twice as painful as equivalent gains. Investors must create written plans during calm periods specifying exact conditions for portfolio changes, excluding market volatility.
• •Context-free numbers mislead: Denominator blindness creates false narratives. A 10,000-person layoff means different things at Walmart versus a 25,000-employee regional company. The claim that groceries increased from $20 to $75 since 1990 ignores that wages rose proportionally, making the comparison meaningless without income context.
• •Tax optimization multiplies returns: Mega Roth backdoor conversions allow traditional 401k holders to pay taxes now and convert to tax-free growth. Multiple account types (401k, IRA, 403b, 529, HSA) provide flexibility for tax-loss harvesting and strategic withdrawals. After-tax returns, not gross performance, determine actual wealth accumulation.