Common sense would dictate this kind of increased volume of sq inches purchased from their display supply chain should yield some substantial discounting on the per unit cost of the display for an iPhone and an iPad!

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At the end of 2012, however, there was about 236 million square meters of home supply on the market, about three times the volume of monthly sales.

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He describes this low-volume, high-return phenomenon in terms of the supply and demand for corporate earnings.

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Companies supply the earnings, and the volume of trading in their shares reflects investor demand for them.

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If the proportion of imported pipeline gas falls, so does the pricing power of conventional suppliers, even if the overall volume they supply goes up.

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The supply of Bitcoins is capped, so as the volume of Bitcoin-denominated transactions grows, the value of Bitcoins will have to increase to accomodate it.

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Volume and price rise and fall together, a consequence of tight or loose supply, like oil.

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With feed costs going up, Mr Downes said he would also be forced to increase the volume of feed bought in over the winter, with the farm's ability to sustain its own supply badly hit.

BBC: Richard Downes