Brazil's exchange must also overcome scepticism on the buyer's side of the market.

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Goldman, meanwhile, found a buyer or two on the other side of the trade.

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But when the real estate agent leaves the room, the buyer and seller often do a little business on the side.

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On the retail side, stores in the airport will use a combination of cameras and sensors to monitor buyer behavior and to get a better sense of what types of displays work.

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Would a Google system ever have a buyer take money out of Google media and allocate it to Microsoft, Yahoo, Apple or other supply-side aggregators?

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It was the highest sale price on the California side of the lake in 2012, according to Bill Dietz of Tahoe Luxury Properties, who represented the buyer.

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