====== 经济学基本假设 ======

<   a2s>
.-----------------------.       .-----------------.
|[axiom]                |       |[no ineffi]      |
| Rational Choice Axiom +------>| No inefficiency |===+
'--+--------------------'       '------------+----'   |
   |                                                  |
   |   .------------------------.                     |
   |   |[self benefit]          |          otherwise, |
   |   |                        |                     |
   |   |Maximum of self benefit +=+        always looking for    
   +-->|under constraint        | |        hidden constraint
   |   '------------------------' |                   :
   |                              |                   |
   |   .--------------------.     |                   |
   |   |[prefer variety]    |     |                   |
   |   |                    |     |                   |
   |   |Diminishing Marginal|     |                   |
   +-->|rate of substitution|     |                   |
       '--------------------'     |                   |
                                  |                   |
                         benefit  |                   |
                        +--------=+=----+             |
                        |               :             |
                        v               v             |
                .------------.   .------------.       |
                |            |   |[subj const]|       |
                | Subjective |   | Subjective |       |
                | Value      |   | Constraint |<------+
                '------------'   | Condition  |  
                                 '------------'               
               
[axiom]: {"fill":"#0A2F51","a2s:delref":true}
[self benefit]: {"a2s:link":"https://xiepie.net/micro/axiom/rationality","fill":"#0E4D64","a2s:delref":true}
[prefer variety]: {"a2s:link":"https://xiepie.net/micro/axiom/diminishing_marginal_utility","fill":"#0E4D64","a2s:delref":true}
[subj const]: {"a2s:link":"https://xiepie.net/micro/constraint", "stroke":"#F50078", "stroke-dasharray":"5 5", "stroke-width":4, "a2s:delref":true}
[no ineffi]: {"a2s:link":"https://xiepie.net/micro/axiom/no_inefficiency", "a2s:delref":true}


</a2s>
经济学是科学，科学理论一定是[[https://wiki.mbalib.com/wiki/%E5%85%AC%E7%90%86%E5%8C%96%E6%96%B9%E6%B3%95|公理体系]](系统)。公理体系是由公理假设、逻辑推导、逻辑结论三位一体的有机整体。那么经济学的*公理假设*是什么呢？
  - 人人追求约束下的利益最大化（__[[micro:axiom:rationality|自利假设]]__）；
  - 对于经济物品来说，多比少好，有比无强，而且人们还喜欢多样化（__[[micro:axiom:diminishing_marginal_utility|边际效用递减]]__）。