a fall in prices造句

This had been expected to lead to a fall in prices from ? 9 on friday , but prices finished at about ? 15 per tonne
市场本来预计，这会导致二氧化碳排放权价格从上周五的9欧元下滑，却不料该价格收于每吨15欧元左右。
Tourism is the second biggest foreign exchange earner for zanzibar , but is expected to increase in importance because of the collapse of the islands ' clove export trade due to a fall in prices caused by global oversupply
观光是尚吉巴第二大外汇来源，预料随著这些岛屿的丁香出口贸易因全球供过于求导致价格下跌而崩盘后，观光的重要性将日益重要。
It's difficult to find a fall in prices in a sentence. 用a fall in prices造句挺难的