He himself has a warehouse with an estimated half a million dollars of unsellable wool.

有一个仓库，里面估计有50万美元羊毛卖不出。

And they have learned how to handle diseases better, reducing the quantity of fish that ends up being unsellable.

而且们学会了怎么控制鱼类，从而减少了最后无法卖出鱼数量。