Algorithmic social media has been engineered to optimize for outrage and anger, which is not only misaligned with long-term investor needs but also amplifies cognitive biases through targeted ad profiling based on credit scores, browsing habits, and personal preferences.

Money is not a store of value; it is a medium of exchange that should always be in motion and working on your behalf through investments, real estate, or business ventures rather than sitting idle in a bank account.

The first job of the investor is to understand reality as it is, not as desired or imagined, and this is what makes investing fundamentally different from politics where feedback loops are slow.

Leaving law to switch to trading eliminated Ritholtz's sense of agency as an attorney—where his research contributions were underutilized and he received no feedback—and money ultimately mattered to him as a path to freedom from that sense of powerlessness rather than as wealth per se.

Money's greatest value is that it frees you from having to do things you don't want to do and allows you to focus your effort, time, and energy on what you actually want to pursue.

A deflationary or zero-inflation world creates perverse incentives where consumers rationally delay purchases because goods will be cheaper tomorrow, triggering negative economic spirals, which is why some modest amount of inflation is structurally healthy for economies.

Purchasing power is a double-entry bookkeeping problem: if the dollar has fallen, wages must be examined simultaneously to determine real purchasing power, and by this metric median income earners today can purchase more goods and services than could have been done a century ago despite nominal devaluation.

The Keynesian 'money illusion'—where people think in nominal rather than real terms—is fundamentally a cognitive constraint caused by the fact that our mental models are necessarily built from past experiences, and we traverse through time with 200-millisecond sensory delays, meaning we are always behind the curve of reality.

Experts are systematically wrong about the future because they are experts on an earlier version of the world, not the current one, meaning past expertise becomes a liability rather than an asset when conditions change.

People mentally anchor to housing prices from the past and fail to update models when market conditions change, causing them to demand the same prices they would have received in prior years despite changed market fundamentals.

Bitcoin should be understood as a technology stock (valued between Google and Facebook in market cap) rather than as a currency or new asset class, and viewing it this way clarifies its poor performance as a medium of exchange and store of value.

The narrative surrounding Bitcoin has rotated through approximately a dozen different framings (deflation hedge, inflation hedge, financial adoption story, etc.) over 15 years, each persisting until disproven or falling out of favor, demonstrating that all currencies and assets are surrounded by narratives rather than fundamentals.

The best strategy for investors is to curate a team of trusted expert advisors with consistent track records and defensible processes, rather than trying to follow all financial media, because the information diet is the primary bottleneck for investor decision-making.

How Not to Invest presents approximately 100 short nuggets of behavioral biases, investment mistakes, and reasoning errors, with 90% of the book dedicated to avoidance strategies ('don't do this') rather than positive prescriptions.

95% of professional fund managers underperform their benchmark over 10 years net of fees, and worse, individual investors underperform their own investment choices through behavioral errors like buying after runups when the manager appears on television.

Survivorship bias led economists to incorrectly believe that the average mutual fund outperformed the market until an academic study in the 1990s (circa 1991 or 1996) revealed that once failed funds were included in analysis, most managers substantially underperformed after fees.

Young investors face greater financial stress from career uncertainty than from market volatility, but as they age and develop professional confidence, they become less vulnerable to market timing errors because they understand markets are cyclical and temporary.

The market crash where Ritholtz had the most at risk—the COVID crash in Q1 2020—was the one where he felt completely blasé, whereas earlier crashes with smaller stakes felt terrifying, suggesting that experience and perspective matter more than percentage losses for emotional response.

Charlie Munger stated that he and Warren Buffett believed they were not smarter than others, just 'less stupid,' which captures the essence of investor success—avoiding mistakes rather than exceptional brilliance.

Most investors overestimate their influence on currency and market outcomes and should not obsess over Federal Reserve policy or inflation narratives because the U.S. dollar has structural economic advantages that protect its status, and individual investors have minimal control over these forces regardless.