But a new breed of task is becoming a bigger part of the Mechanical Turk mix, where at any moment as many as 350, 000 HITs are open for bids.

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In spectrum auctions, bidding stays open until no new bids are received, at which point the entire auction ends.

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Meanwhile, London Mayor Boris Johnson is seemingly open to hearing more bids for the stadium, and recently had to deny that he was speaking with the NFL about the potential of hosting a London franchise.

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Djokovic, who helped Serbia reach the quarterfinals of the World Group of the Davis Cup for the first time in the week following his Dubai success, will next target the Masters events in the United States in early spring before turning his attentions to the French Open at Roland Garros as he bids to extend his grand slam tally.

CNN: Djokovic wants Federer's crown

Meanwhile, the European Union discussed whether to close state contracts to bids from foreign firms in countries that do not open their own bidding processes to European firms.

ECONOMIST: Business this week

It gave him a four-shot lead as he bids to earn a place at next month's Open Championship at St Andrews.

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