但几乎所有供给曲线都有一个基本相似之处：它们的斜率都是 _______________。

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问题要点在于供应曲线的斜率性质。先把题干的核心意思说清：几乎所有的供给曲线在坐标系中显示的是价格与数量之间的关系，通常随着价格上升，愿意且能够供给的数量也会增加，因此曲线向右上方倾斜，也就是斜率为正。

你给出的答案是“从左到右向上”，这正对应了正斜率的含义。也就是说，价格轴向上，数量轴向右，曲线向右上方延伸，意味着当价格提高时，生产者愿意提供更多商品，符合供给法则的基本描述。

若要进一步分析这类问题的错误选项，通常会看到几种常见误解，比如：
- 认为供给曲线是“向右下方”倾斜的，这与供给法则相悖，表明错误地将成本或其他因素的影响错置为直接导致数量减少的趋势。 
- 认为供给曲线的斜率是“零”或“无穷大”，这在常规市场模型中并不成立，除非在特定极端情境（如价格几乎固定或供给量无限制）下才可能出现。 
- 只考虑需求对价格的影响而忽略供给方自身在价格变化时的反应，也是常见的混淆。

综上，给出的“从左到右向上”描述准确地反映了大多数供给曲线的正斜率特征，即价格上升时供给量上升，曲线向右上方倾斜。

经济&202 33295 第三章测验

但几乎所有供给曲线都有一个基本相似之处：它们的斜率都是 _______________。

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