Below is a text with blanks. Click on each blank, a list of choices will appear. Select the appropriate answer choice for each blank.
下面的文本有一些空格。点击每个空格会出现一组选项，请为每个空格选出最合适的答案。
The supply of a thing, in the phrase "supply and demand", is the amount that will be offered for sale at each of a series of prices; the demand is the amount that will be bought at each of a series of prices. The principle that value depends on supply and demand means that in the case of nearly every commodity, more will be bought if the price is lowered, less will be bought if the price is . Therefore sellers, if they wish to induce buyers to more of a commodity than they are already doing, must reduce its price; if they raise its price, they will sell less. If there is a general falling off, if in demand — due, say, to trade depression — sellers will either have to prices or put less on the ; they will not be able to sell the same at the same price.
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