Luck and risk: traders at the New York Stock Exchange. Photograph: Lucas Jackson/Reuters

Report spanning 34 years charts (frequent) agony and (rare) ecstasy of stock-picking

Checking stock prices too often is not good for your financial health, according to research. Photograph: Andrew Burton/Getty Images

Financier believes investors must focus only on specified criteria

The link between wealth and happiness is less strong than commonly assumed, but research suggests clever spending may yield bene(...)

Pause for thought: multiple signals indicate that the US stock market faces years of sub-par returns. Photograph: Andrew Burton/Getty Images

Bulls are not convinced by indicators showing that the US market is severely overvalued

Bears v bulls: as US markets hit new highs, bearish observers warn that a crash may be imminent but only some bearish arguments have merit. Photograph: Krisztian Bocsi/Bloomberg

There are always reasons to be cautious, but most warnings are easily debunked

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