Ordinal utility settles the order of preferences in our heart which can be manifested by the consumer indifference curve . Therefore a reasonable preference-oriented index constitute the basis of demand theory .
Perhaps the best remedy for possible confusion is to avoid using any numbers for ordinal rank ; the rank concept can just as well be expressed in letters ( a , b , c ...... )
No arithmetical operations whatever can be performed on ordinal numbers ; therefore , to use the term " measurable " in any way for ordinal numbers is hopelessly to confuse the meaning of the term .
算术运算无论如何不能运用于序数;因此,对可以度量这一术语的任何使用方法将必然混淆术语的意义。
By the law of diminishing marginal utility ( ordinal ) , the second , third , fourth eggs , and so on , rank below the first egg on his value scale , and in that order .