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学习笔记|国民收入的决定 IS—LM模型

  • 2026-03-24 04:59:59
学习笔记|国民收入的决定 IS—LM模型

01

模型总览

IS-LM 模型是凯恩斯经济学核心,用于说明产品市场 + 货币市场同时均衡时,国民收入y 与利率r被共同决定,是分析宏观财政、货币政策效果的工具。

02

投资的决定

1、经济学中的投资

实际资本形成(厂房、设备、存货、新住宅),证券 / 土地买卖是产权转移,不算投资。

2、决定因素

  • 实际利率(首要):投资是利率的减函数,公式:i = e - dr

    • e:自主投资(r=0 时的投资)

    • d:投资对利率的敏感系数

  • 预期收益:需求预期、产品成本、投资税抵免

  • 风险:经济繁荣→风险低;经济下行→风险高

03

IS 曲线(产品市场均衡)

1、含义

产品市场均衡(i=s)时,利率 r 与国民收入 y 的反向关系曲线,线上每一点都满足投资 = 储蓄。

2、公式(两部门)

3、斜率

斜率绝对值:(1-β)/d

  • d 越大(投资对利率越敏感)→ IS 越平缓

  • β 越大(边际消费倾向越大)→ IS 越平缓

  • 比例税下:斜率→[1-β(1-t)]/d,税率 t 越大→IS 越陡峭

4、曲线移动

  • 右移(扩张):投资↑、消费↑、政府购买 g↑、减税 t↓

  • 左移(紧缩):投资↓、储蓄↑、政府购买 g↓、增税 t↑

  • 移动幅度:Δy = 乘数 × 自发支出变动量

04

利率的决定

1、核心结论

利率由货币供给m货币需求L共同决定,货币供给是央行控制的外生变量。

2、货币需求(流动性偏好)

三大动机:

  • 交易动机:与收入 y 正相关

  • 谨慎动机:与收入 y 正相关

  • 投机动机:与利率 r 负相关(债券价格与利率反向)

3、货币需求函数

L=L1+L2=ky−hr

  • L₁=ky:交易 + 谨慎需求

  • L₂=-hr:投机需求

  • k:货币需求对收入的敏感系数

  • h:货币需求对利率的敏感系数

4、流动偏好陷阱

利率极低时,人们只持有货币不买债券,货币需求无限大,货币政策失效

5、货币供求均衡

货币供给 m 垂直,与需求 L 交点决定均衡利率 r₀;需求右移→r↑,供给右移→r↓。

05

LM 曲线(货币市场均衡)

1、含义

货币市场均衡(m=L)时,利率 r 与国民收入 y 的正向关系曲线,线上每一点都满足货币供给 = 需求。

2、公式

3、斜率

斜率:k/h

  • k 越大→LM 越陡峭

  • h 越大(投机需求对利率越敏感)→LM 越平缓

4、曲线移动

仅由实际货币供给m变动引起:

  • 右移:名义货币 M↑、价格 P↓

  • 左移:名义货币 M↓、价格 P↑

06

IS-LM 一般均衡

1、均衡条件

联立 IS 与 LM 方程,唯一交点满足:

  • 产品市场:i = s

  • 货币市场:L = m

2、非均衡区域调整

3、均衡与政策

  • 交点均衡不一定是充分就业

  • 财政政策:移动 IS 曲线(g↑、t↓→IS 右移)

  • 货币政策:移动 LM 曲线(M↑→LM 右移)

  • 政策搭配可实现充分就业均衡

07

关键公式速记

  • 投资:i = e - dr

  • IS 曲线:y = (α+e-dr)/(1-β)

  • 货币需求:L = ky - hr

  • LM 曲线:m = ky - hr

  • 均衡:联立 IS、LM 求解 r、y

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  1. CONNECT:[ UseTime:0.000603s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000805s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006060s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000278s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000523s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000508s ]
  8. SELECT * FROM `article` WHERE `id` = 476770 LIMIT 1 [ RunTime:0.001087s ]
  9. UPDATE `article` SET `lasttime` = 1774336642 WHERE `id` = 476770 [ RunTime:0.018243s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000704s ]
  11. SELECT * FROM `article` WHERE `id` < 476770 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001176s ]
  12. SELECT * FROM `article` WHERE `id` > 476770 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000998s ]
  13. SELECT * FROM `article` WHERE `id` < 476770 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006854s ]
  14. SELECT * FROM `article` WHERE `id` < 476770 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.023193s ]
  15. SELECT * FROM `article` WHERE `id` < 476770 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.024270s ]
0.161322s