Art addicts will gather in London next week to get their fix when Sotheby's and Christie's sell impressionists and contemporary pictures by the hundreds. Market analysts will also be watching closely. Last November, when both auction houses held the year's biggest impressionist and modern art sales in New York, Sotheby's fell well short of its estimate and Christie's did less well than hoped. Economic and financial clouds have thickened since then, and there are fewer bonuses to spend on art. But many collectors will still turn up, motivated by passion rather than money.
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