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(2012年高考江苏政治卷第6题)图1表示某商品供给量和价格的关系(横轴为供给量,纵轴为价格,S_1为变动前曲线,S_2为变动后曲线)。在不考虑其他因素条件下,以下变量中会导致S_1向S_2方向平行移动的是()①该商品劳动生产率提高②该商品的市场价格提高③该商品的生产成本下降④生产该商品的企业减少A.①②B.①③C.②③D.③④
(2012 college entrance examination in Jiangsu political volume 6) Figure 1 shows the relationship between the amount of supply of a commodity and price (horizontal axis for the supply, the vertical axis for the price, S_1 for the curve before the change, S_2 for the curve after the change). Without considering other factors, the following variables will lead to S_1 moving in parallel with S_2 direction: (1) the labor productivity of the commodity increases ② the market price of the commodity increases ③ the production cost of the commodity declines ④ the number of enterprises that produce the commodity decreases A.①②B.①③C.②③D.③④