这种类型的水溶笔是使用最广泛的一种，但这种笔的市场价格较高。
This type of water-soluble pens are one of the most widely used, but the sum of market prices higher.
在大市场中只有少数是交易员，他们很容易就串通起来压低公平市场价格；他们通过较高的价格卖出大豆以大幅度提高利润。
With only a few traders at each mandi, they can easily collude to ensure that they pay less than the fair market price; they can then boost their profits by selling on the beans at a higher price.
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