Convex function of demand, convex distribution of price and an optimal model for coexistence of multi-prices are established.

建立了商品销售中的凸需求函数，凸分布和多种价格并存的优化模型。

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BigWords also claims to optimize prices by looking for multi-item specials, shipping discounts, coupons, and other exceptional deals.

BigWords还声称能通过寻找特价、折扣、赠券和其他优惠活动起到优化价格的效果。

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Importantly, the gold and silver futures markets were ripe for corrective, technical and profit-taking pullbacks following recent strong gains that had sent gold and silver prices to multi-month highs earlier this week.

FORBES: Comex Gold, Silver Try To Recover From Wednesday's Shellacking

Both gold and silver are seeing some mild profit-taking pressure and some chart consolidation following recent solid gains that have seen prices hit multi-month highs.

FORBES: Gold Slightly Lower on Profit Taking, Chart Consolidation; Bulls Still Technically Strong

Multi-year highs in oil prices have pushed the consumer further back, forcing them to cut back on discretionary spending as they focus on necessities.

FORBES: No Recovery Possible While U.S. Consumer Continues Deleveraging