And collision-avoidance systems will provide an extra margin of safety for the driver of a small car who's worried about being crushed by a larger vehicle.

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Where did the extra margin come from?

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If the retailer's overall costs--such as labor, shipping, marketing and other products--remain static, that extra penny of margin can flow to the bottom line.

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If my basic premise is right, the declining price will force traders to sell their commodities contracts to raise the cash to raise the extra cash needed to satisfy the higher margin requirements.

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Los Angeles extended the margin to 7-0 in the fourth, scoring four runs on five extra-base hits.

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