同学，我的意思是对消费者的效用应该和对生产者的有一样的走势啊

是的。但我说的不是最终，而是最初时的走势。

Not the same thing. Indifference curves measures the tradeoff between two goods, the subsitubility, it is not like the diminishing marginal utility that measures the additional utility associated with an additional unit assumption.  It depends on the relative abundence of two goods, not how much you like one of them. Not necessarily correct, just my two cents.