While the average consumer does not feel the price difference because salt makes up such a small portion of a typical grocery bill, the markup supports a vast and pernicious underground market, the authors wrote. 这些作者写道,虽然由于食盐在平时的杂货开销中所占比例较小,普通消费者没有感觉到价格差别,但这种利润支撑着一个规模庞大的、有害的地下市场。