1,2,3,4,5,6,7,8,9,10,11,12,13,補1,補2,補3
一次斉次な関数
全ての変数を 倍すると、関数の値も
倍になる場合、そのような関数は「一次斉次 (homogenous of degree one)」であると言います。(注:一次同次と呼ぶことも多い。)例えば
は、
![Rendered by QuickLaTeX.com A](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-7c472eb23904478dc94dd673e791751a_l3.png)
![Rendered by QuickLaTeX.com \alpha](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-f849991fa69674292d6bdf9573703e4f_l3.png)
![Rendered by QuickLaTeX.com K, N](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-5b9484001f8aa4264a87fa32b1672805_l3.png)
![Rendered by QuickLaTeX.com K](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-fff91e6883d21b1f84f8b95db3c4ec99_l3.png)
![Rendered by QuickLaTeX.com N](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-b4503199893b4c35bce9fde7c1a7d93e_l3.png)
![Rendered by QuickLaTeX.com mK](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-b3abfa740f6d59324d48775020fc6a7d_l3.png)
![Rendered by QuickLaTeX.com mN](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-ca4eca60a0bd3e7c7b1ff7642b2f3c67_l3.png)
となり、確かに関数の値が元の
![Rendered by QuickLaTeX.com m](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-9a6bd40cd8d6bf885dfdfdcf0b05b760_l3.png)
別の例としては
があります。
![Rendered by QuickLaTeX.com x](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-edea89885ee0f186f27ae02da4db506b_l3.png)
![Rendered by QuickLaTeX.com y](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-7c57f06e296f943105549eda32ccf6f9_l3.png)
![Rendered by QuickLaTeX.com mx](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-48f37fabfa99b49488711ec01d43cf79_l3.png)
![Rendered by QuickLaTeX.com my](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-8da83f43d15807d2a2ec9f971bf66464_l3.png)
となり、関数の値は元の
![Rendered by QuickLaTeX.com g(x,y)](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-cf0ab296f71cb066c181ccf05b7ca111_l3.png)
![Rendered by QuickLaTeX.com m](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-9a6bd40cd8d6bf885dfdfdcf0b05b760_l3.png)
経済学で一次斉次の関数が使われるのは主に「生産関数」と「マッチング関数」です。生産関数が一次斉次であると仮定することは、「資本や労働など、生産に必要な全ての要素の投入量を2倍、3倍、
![Rendered by QuickLaTeX.com m](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-9a6bd40cd8d6bf885dfdfdcf0b05b760_l3.png)
![Rendered by QuickLaTeX.com m](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-9a6bd40cd8d6bf885dfdfdcf0b05b760_l3.png)
「マッチング関数」は、例えば相手を探す男性の数と女性の数を入れると、成立するカップルの数が出てくるような関数です。男性の数と女性の数がそれぞれ2倍、3倍、
![Rendered by QuickLaTeX.com m](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-9a6bd40cd8d6bf885dfdfdcf0b05b760_l3.png)
![Rendered by QuickLaTeX.com m](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-9a6bd40cd8d6bf885dfdfdcf0b05b760_l3.png)
![Rendered by QuickLaTeX.com m](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-9a6bd40cd8d6bf885dfdfdcf0b05b760_l3.png)
![Rendered by QuickLaTeX.com m](https://blog-study-economics.com/wp-content/ql-cache/quicklatex.com-9a6bd40cd8d6bf885dfdfdcf0b05b760_l3.png)
「一次斉次の関数」の定義、具体例、意味合いをしっかり言えるように、頭に入れておきましょう。