{"id":1104,"date":"2025-07-03T10:00:00","date_gmt":"2025-07-03T01:00:00","guid":{"rendered":"https:\/\/fukugrow.jp\/?p=1104"},"modified":"2025-07-15T21:34:29","modified_gmt":"2025-07-15T12:34:29","slug":"72%e3%81%ae%e6%b3%95%e5%89%87%ef%bd%9c%e5%b9%b4%e5%88%a9%e3%81%a7%e5%89%b2%e3%82%8b%e3%81%a0%e3%81%91%e3%81%a72%e5%80%8d%e3%81%ab%e3%81%aa%e3%82%8b%e5%b9%b4%e6%95%b0%e3%81%8c%e3%82%8f%e3%81%8b","status":"publish","type":"post","link":"https:\/\/fukugrow.jp\/?p=1104","title":{"rendered":"72\u306e\u6cd5\u5247\uff5c\u3069\u3046\u3057\u306672\u3092\u91d1\u5229\u3067\u5272\u308b\u3068\uff12\u500d\u306b\u306a\u308b\u5e74\u6570\u304c\u5206\u304b\u308b\u306e\u304b"},"content":{"rendered":"\n

\u300c\u304a\u91d1\u304c2\u500d\u306b\u306a\u308b\u307e\u3067\u3001\u4f55\u5e74\u304b\u304b\u308b\u3093\u3060\u308d\u3046\uff1f\u300d<\/p>\n\n\n\n

\u305d\u3093\u306a\u7591\u554f\u306b\u3001\u9a5a\u304f\u307b\u3069\u30b7\u30f3\u30d7\u30eb\u306a\u5f62\u3067\u7b54\u3048\u3066\u304f\u308c\u308b\u306e\u304c\u300c72\u306e\u6cd5\u5247\u300d\u3067\u3059\u3002<\/p>\n\n\n\n

\u6b63\u76f4\u306a\u3068\u3053\u308d\u3001\u3053\u306e\u6cd5\u5247\u3092\u77e5\u3063\u3066\u3044\u308b\u3060\u3051\u3067\u3001\u6295\u8cc7\u3084\u8cc7\u7523\u5f62\u6210\u306b\u5bfe\u3059\u308b\u898b\u65b9\u304c\u30b0\u30c3\u3068\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u300c\u5e74\u5229\u300d\u3068\u300c72\u300d\u3092\u5272\u308b\u3060\u3051\u3067\u3001\u3056\u3063\u304f\u308a\u3068\u3057\u305f\u500d\u306b\u306a\u308b\u5e74\u6570<\/strong>\u304c\u5206\u304b\u308b\u3002\u2014\u2014\u306a\u3093\u3066\u4fbf\u5229\u306a\u516c\u5f0f\u3067\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u3067\u3082\u3001\u3075\u3068\u8003\u3048\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f<\/p>\n\n\n\n

\u300c\u306a\u3093\u306772\u306a\u306e\u304b\uff1f\u300d\u300c\u306a\u3093\u3067\u5272\u308a\u7b97\u3060\u3051\u3067\u305d\u3093\u306a\u3053\u3068\u304c\u308f\u304b\u308b\u306e\u304b\uff1f\u300d<\/p>\n\n\n\n

\u4eca\u56de\u306f\u3053\u306e\u201c72\u306e\u4e0d\u601d\u8b70\u201d\u3092\u3001\u3084\u3055\u3057\u304f\u3001\u305d\u3057\u3066\u5c11\u3057\u3060\u3051\u6570\u5b66\u7684\u306b\u89e3\u304d\u660e\u304b\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n[lwptoc]\n\n\n

2\u500d\u306b\u306a\u308b\u307e\u3067\u306e\u6642\u9593\u306e\u6570\u5b66\u5f0f<\/strong><\/h2>\n\n\n\n

\u307e\u305a\u306f\u57fa\u672c\u5f0f\u304b\u3089\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u304a\u91d1\u304c\u5e74\u5229 r \u3067\u5897\u3048\u7d9a\u3051\u308b\u3068\u304d\u3001n \u5e74\u5f8c\u306b\u306f\uff1a<\/p>\n\n\n

\"(1 + r)^n\"<\/p>\n\n\n\n

\u500d\u306b\u306a\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u3068\u3044\u3046\u306e\u306f\u3001\u3064\u307e\u308a\uff1a<\/p>\n\n\n

\"(1 + r)^n = 2\"<\/p>\n\n\n\n

\u3053\u306e\u5f0f\u306e\u4e21\u8fba\u306b\u300clog\uff08\u5bfe\u6570\uff09\u300d\u3092\u53d6\u308b\u3053\u3068\u3067\u3001\u6307\u6570\u3092\u89e3\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n

\"n \cdot \log(1 + r) = \log 2\"<\/p>\n\n\n\n

\u3057\u305f\u304c\u3063\u3066\u3001<\/p>\n\n\n

\"n = \frac{\log 2}{\log(1 + r)}\"<\/p>\n\n\n\n

\u3053\u3053\u304c\u300c72\u306e\u6cd5\u5247\u300d\u306e\u539f\u70b9\u3067\u3059\u3002<\/p>\n\n\n\n

\u3053\u306e\u5f0f\u3092\u3082\u3063\u3068\u7c21\u5358\u306b\u4f7f\u3048\u308b\u5f62\u306b\u3059\u308b\u306b\u306f\u3001\u300clog(1 + r)\u300d\u306e\u90e8\u5206\u3092\u8fd1\u4f3c<\/strong>\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\uff08\u61d0\u304b\u3057\u3044\uff09<\/p>\n\n\n\n

\u306a\u305c\u8fd1\u4f3c\u304c\u4f7f\u3048\u308b\u306e\u304b\uff1f\uff5cr\u304c\u5c0f\u3055\u3044\u3068 log(1+r) \u2252 r \u306b\u306a\u308b\u7406\u7531<\/strong><\/h2>\n\n\n\n

\u9ad8\u6821\u6570\u5b66\u3067\u5b66\u3076\u30c6\u30a4\u30e9\u30fc\u5c55\u958b<\/a>\u3092\u4f7f\u3046\u3068\u3001\u4ee5\u4e0b\u306e\u8fd1\u4f3c\u5f0f\u304c\u5c0e\u304b\u308c\u307e\u3059\uff1a<\/p>\n\n\n

\"\log(1 + r) = r - \frac{r^2}{2} + \frac{r^3}{3} - \cdots\"<\/p>\n\n\n\n

\u5e74\u5229 r \u304c\u5c0f\u3055\u3044\uff08\u4f8b\u3048\u3070 0.05 = 5%\uff09\u3068\u304d\u306f\u3001<\/p>\n\n\n

\"r^2, r^3 \dots\"<\/p>\n\n\n\n

\u3068\u3044\u3063\u305f\u9805\u306f\u307b\u3068\u3093\u3069\u30bc\u30ed\u306b\u8fd1\u304f\u306a\u308b\u305f\u3081\u3001<\/p>\n\n\n

\"n = \frac{\log 2}{r}\"<\/p>\n\n\n\n

\u304c\u6210\u308a\u7acb\u3061\u307e\u3059\u3002\u3053\u308c\u3092\u5143\u306e\u5f0f\u306b\u4ee3\u5165\u3059\u308b\u3068\uff1a<\/p>\n\n\n

\"n = \frac{\log 2}{r}\"<\/p>\n\n\n

\"\log 2 = 0.6931\"<\/p>\n\n\n\n

\u306a\u306e\u3067\u3001<\/p>\n\n\n

\"n = \frac{0.6931}{r}\"<\/p>\n\n\n\n

\u3064\u307e\u308a\u3001\u5229\u7387\u304c\u5c0f\u3055\u3051\u308c\u3070\u5c0f\u3055\u3044\u307b\u3069\u300clog(1 + r) \u2252 r\u300d\u306f\u3088\u304f\u5f53\u3066\u306f\u307e\u308b<\/strong>\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n

\n\n\n\n

\u306a\u3093\u3067\u300c69\u300d\u3058\u3083\u306a\u304f\u300c72\u300d\u304c\u4f7f\u308f\u308c\u308b\u306e\u304b\uff1f<\/strong><\/h2>\n\n\n\n

\u3055\u304d\u307b\u3069\u306e\u5f0f\uff1a<\/p>\n\n\n

\"n = \frac{0.6931}{r}\"<\/p>\n\n\n\n

\u3053\u308c\u306f\u300c0.6931\u300d\u3068\u3044\u3046\u5b9a\u6570\u3092\u4f7f\u3063\u3066\u30012\u500d\u306b\u306a\u308b\u307e\u3067\u306e\u5e74\u6570\u3092\u6c42\u3081\u308b\u5f0f\u3067\u3057\u305f\u3002<\/p>\n\n\n\n

\u3053\u308c\u3092\u300c%\uff08\u30d1\u30fc\u30bb\u30f3\u30c8\uff09\u300d\u3067\u6271\u3046\u306b\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u5909\u63db\u3057\u307e\u3059\uff1a<\/p>\n\n\n

\"n = \frac{69.31}{r}\"<\/p>\n\n\n\n

\u3064\u307e\u308a\u3001\u6570\u5b66\u7684\u306b\u306f\u300c69.31\u300d\u3053\u305d\u304c\u6b63\u78ba\u306a\u4fc2\u6570<\/strong>\u306a\u3093\u3067\u3059\u3002<\/p>\n\n\n\n

\u3067\u3082\u3001\u73fe\u5b9f\u306e\u91d1\u878d\u6559\u80b2\u3084\u6295\u8cc7\u5b9f\u52d9\u306e\u73fe\u5834\u3067\u306f\u300c69.31\u300d\u3088\u308a\u3082\u300c72\u300d\u304c\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u306a\u305c\u3067\u3057\u3087\u3046\uff1f<\/p>\n\n\n\n

\u305d\u308c\u306f\u3001<\/p>\n\n\n\n