NYSE trader: an emphasis on share prices and on meeting quarterly earnings expectations has led to destructive short-term behaviour by some chief executives. Photograph: EPA/Justin Lane

Companies and executives accused of moving from a value-creation approach to one of value extraction

Battered image: Tesco’s auditor, PricewaterhouseCoopers, warned in May of the “risk of manipulation” of financial results. photograph: jeff j mitchell/getty images

Massaging the figures is an age-old problem, and one that is not going to disappear anytime soon

Bill Clinton (right) campaigns for Kentucky secretary of state Alison Lundergan Grimes (left) with Kentucky governor Steve Beshear. photograph: win mcnamee/getty images

Markets typically rally in the months following American midterm elections

Tough times: a trader on the floor of the NYSE during recent market falls. Photograph: Spencer Platt/Getty Images

Stock markets have been volatile of late, many indices suffering double-digit corrections before swiftly rebounding. Is more turmo(...)

Warren Buffett: last week lost more than $2 billion in two days. Photograph: Carlo Allegri/Reuters
Stocktake

Warren Buffett not crying over lost billions

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

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