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10 Biggest Ideas in “How NOT to Invest”

Barry Ritholtz

The challenge in writing How NOT to Invest was organizing a large number of ideas, many of which were only loosely connected, into something coherent, understandable, and, most importantly, readable. That insight greatly simplified my task of making the book both fun to read and helpful for anyone interested in investing.

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Buy the Dip: The Draw and Dangers of Contrarian Investing!

Musings on Markets

Buying the dip" falls into a broad group of investment strategies that can be classified as "contrarian", where investors act in contrast to what the rest of the market is doing at the time, buying (selling) when the vast majority are selling (buying) , and it has been around through all of market history.

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Avoid the Unforced Investment Errors Even Billionaires Make

Barry Ritholtz

In How Not to Invest , I showcase extreme examples of unforced errors to illustrate these behavioral mistakes. Chris Bloomstran, chief investment officer of Semper Augustus Investments Group, has tracked this. Decades as an investor and trader on Wall Street have taught me that panics come and go.

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For the fun of it: An Open House for my Spring 2025 Classes

Musings on Markets

It has sometimes got me some blowback, when I expressed my views about value investing being rigid, ritualistic and righteous and the absolute emptiness of virtue concepts like ESG and sustainability, but so be it. I am aware of things that I need to work on.

Valuation 130
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DeepSeek crashes the AI Party: Story Break, Change or Shift?

Musings on Markets

As the number of potential applications of AI proliferated, thus increasing the market for AI products and services, another part of the story was also being put into play. The AI Story, after DeepSeek I teach valuation, and have done so for close to forty years.

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The Corporate Life Cycle: Corporate Finance, Valuation and Investing Implications!

Musings on Markets

In fact, the business life cycle has become an integral part of the corporate finance, valuation and investing classes that I teach, and in many of the posts that I have written on this blog. Tech companies age in dog years, and the consequences for how we manage, value and invest in them are profound.

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Data Update 1 for 2025: The Draw (and Danger) of Data

Musings on Markets

In corporate finance and investing, which are areas that I work in, I find myself doing double takes as I listen to politicians, market experts and economists making statements about company and market behavior that are fairy tales, and data is often my weapon for discerning the truth.