Many of your managerial decisions will have enormous and possibly fatal effects on a small business.

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Worse, there is a long tradition of interference in the managerial decisions of Pemex, of politicians appointing friends to plum jobs in the company, and of construction contracts being handed out to favoured firms.

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"I felt that in order to be able to take the right managerial decisions, you need to have full information - and this information needs come to you fast and leave you fast as well, " he tells Russia Business Report in his marble office with great views of the Kazan skyline and a neat arrangement of Blackberry, iPhone and iPad on the desk.

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Decision fatigue can also explain other undesirable managerial behaviors, including losing focus in meetings, getting angry with colleagues, or making impulsive, irrational decisions without considering the consequences.

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