求翻译：店铺成本基本上是固定的，超过盈亏平衡点后的销售额的毛利基本上就是纯利（边际利润递增），因此适当多备些货做足正价销售额比缺货的情况盈利更高。是什么意思？

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The cost is basically fixed shops, more than break even point in sales after the gross margin (gross profit margin is basically an incremental) net profit, and it is therefore appropriate for some department stores do more than full-price sales price than the higher earnings.

The shop cost basically is fixed, after surpasses and loss balance point the sales volume gross profit basically is the net profit (marginal returns increasing), therefore suitable prepares goods to make the full positive valance sales volume to be higher than the stockout situation profit.

Shop costs are largely fixed, over after the break even point of sales, net profit margin is basically (increasing marginal profit), preparation of goods was done by appropriate sales more profitable than the stock price higher.

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