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If you want to sell a lot of copies of a financial advice book, historical evidence reveals that an author should recommend a simple formula (e.g., never buy coffee drinks or flip houses with no money down). Unfortunately, the market for actually useful financial advice is small.
The probability someone will buy a useful financial advice book is inversely proportional to their need to read that book. In other words, the people who would benefit most from the book are least likely to buy and actually read it. Many people believe buying the book is enough.
When an actually useful book like Range by David Epstein breaks through to best seller lists, it makes me smile. amazon.com/Range-Generali… 
