The prince's Kingdom Holding Company, whose shares are traded on the Saudi stock exchange, owns stakes in hotel groups including Four Seasons and Fairmont Raffles and is a part-owner of the Savoy Hotel in London.

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In exchange, Indonesia repeated its pledges to reform its economy and to get tough with the militia groups operating in West Timor.

ECONOMIST: Indonesia trades promises for money

By contrast, workers in groups with a lower frequency of favor exchange were only more productive when they received more favors than they gave.

CNN: Helping yourself by helping others

Parties usually deal with interest groups by giving them what they want in exchange for money and votes.

ECONOMIST: Special-interest groups

Fairtrade USA left Fairtrade International in 2011, and other groups such as Equal Exchange have expanded consumer options for more fairly traded products.

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Heavy interventions in the foreign-exchange markets always raise a stink at the groups, forums and committees where Japan's policymakers come face to face with their American counterparts.

ECONOMIST: Currency conundrums | The

He reminisces about how all the pop groups back in the day would play short riffs to one another and exchange ideas.

BBC: Sir Paul McCartney: Ordinary yet extraordinary

The profile that users create for themselves, the information exchange they take part in, the pages they view, the comments they make, the groups they join, the videos they watch and the links they access, all generate heaps of data that can be analyzed to create a detailed individual character profile.

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