经济学问题。急。考试呢1，Appraisewhether the law of diminishing returns

1、Diminishing marginal returns is a basic concept of economics, is defined in a resource as the investment of the enterprise, the resource unit into the utility of the product output is diminishing, in other words is although the output is increasing, but the second derivative negative, the growth rate will continue to slow, making its final tends to peak, and likely to decline, you can change elements of the marginal yield will decrease. When an article is the total number of more and more consumption, consumption of the newly increased the last unit items (i.e., marginal utility) utility usually has fewer phenomenon (decreasing), the marginal utility law of diminishing；
Economic of scale is a term that is used to describe d reduction in cost-per-unit as more unit are produced.eg.if a company makes 500 widgets,they cost d company 10 cents a piece to produce.Another company makes100,000widgets,and can therefore purchase d materials necessay to make them for much cheaper than its competitors, so each widget only costs this company 5cents a piece to produce.