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学习笔记|总需求—总供给模型

  • 2026-03-25 14:08:07
学习笔记|总需求—总供给模型

01

本章核心定位

  • 取消价格水平固定不变假定,重点说明产量(国民收入)与价格水平的关系。

  • 总需求(AD)学界共识一致;总供给(AS)是宏观经济学最具争议的内容

  • 用于解释经济波动、萧条、过热、滞胀,是宏观政策分析基础工具。

02

总需求曲线(AD)

1、总需求定义

经济社会对产品和劳务的需求总量,以总支出衡量,由消费 + 投资 + 政府购买 + 净出口构成。

2、总需求函数

国民收入表示的需求总量与价格水平的关系;几何图形为向右下方倾斜的总需求曲线。

3、价格水平影响总需求的三大效应

  • 利率效应:P↑→货币需求↑→利率↑→投资↓→总支出与产出↓

  • 实际余额效应:P↑→资产实际价值↓→相对贫穷→消费↓

  • 税收效应:P↑→名义收入↑→进入更高税档→可支配收入↓→消费↓

4、总需求曲线推导

IS-LM 模型推导(联立产品市场与货币市场均衡)。

  • IS 方程:y = c (y−t) + i (r) + g

  • LM 方程:M/P = L₁(y) + L₂(r)

5、总需求曲线移动

  • 扩张性政策(增政府支出、减税、扩货币供给)→AD 右移

  • 紧缩性政策 →AD 左移

  • 财政 / 货币政策均为需求管理政策

03

总供给曲线(AS)

1、总供给定义

经济社会投入基本资源所生产的总产量(GDP);总供给函数为总产量与价格水平的关系。

2、三类总供给曲线(按工资与价格调整速度划分)

(1)古典总供给曲线

  • 形状:垂直于潜在产量 yf

  • 假设:工资 W 与价格 P充分伸缩 / 迅速调整,实际工资恒为充分就业水平

  • 含义:长期总供给;产量固定在充分就业,不随价格变动

  • 政策含义:扩张需求只抬升物价,不增加产出,易引发通胀

(2)凯恩斯总供给曲线

  • 形状:水平线(充分就业前),充分就业后垂直

  • 假设:货币工资刚性,W 与 P 完全不调整(大萧条背景)

  • 含义:短期极端情形;未充分就业时,可按既定价格提供任意产量

  • 政策含义:扩张需求可提升产出至充分就业,不抬价

(3)常规总供给曲线

  • 形状:向右上方倾斜(线性 / 非线性)

  • 核心原因:要素价格黏性(工资、原材料合同长期固定)

  • 非线性特征:萧条段平缓(产量易增、价慢涨);接近 / 超充分就业段陡峭(价快涨、产量难增)

  • 斜率意义:越平缓→W 与 P 调整越慢;越陡峭→调整越快

3、短期总供给曲线移动因素

  • 劳动供给量变动

  • 物质 / 人力资本增减

  • 自然资源可获得性

  • 技术进步

  • 预期价格水平(预期 P↑→工资↑→成本↑→AS 左移)

04

AD-AS 模型的现实解释

1、宏观经济短期目标

AD 与 AS 交于充分就业 yf,实现充分就业 + 物价稳定

2、总需求移动的后果

  • AD 左移:萧条→产量↓、价格↓(产量降幅 > 价格降幅)

  • AD 右移:经济过热→产量↑有限、价格↑(价格涨幅 > 产量涨幅)

3、总供给移动的后果

  • AS 左移(成本冲击、资源短缺):滞胀→产量↓+ 价格↑(失业与通胀并存)

  • AS 右移(技术进步):产量↑、价格↓(短期极少见)

05

微观供求 vs 宏观 AD-AS

  • 相同:均由供求决定均衡价格与数量

  • 不同:微观是单个商品;宏观是整个社会价格水平与国民收入

06

关键结论速记

  • AD 曲线向右下倾斜,由 IS-LM 推导,受政策与价格效应驱动。

  • AS 分三类:古典垂直、凯恩斯水平、常规右上倾斜。

  • 古典:长期、充分就业、需求只影响价格。

  • 凯恩斯:短期萧条、工资刚性、需求拉动产量。

  • 常规:黏性价格,短期产量与价格同向。

  • AD 左移→萧条;AS 左移→滞胀;AD 右移→过热。

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  1. CONNECT:[ UseTime:0.001211s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001870s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000742s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000627s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001556s ]
  6. SELECT * FROM `set` [ RunTime:0.000629s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001438s ]
  8. SELECT * FROM `article` WHERE `id` = 477422 LIMIT 1 [ RunTime:0.000990s ]
  9. UPDATE `article` SET `lasttime` = 1774479709 WHERE `id` = 477422 [ RunTime:0.032585s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.036971s ]
  11. SELECT * FROM `article` WHERE `id` < 477422 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001556s ]
  12. SELECT * FROM `article` WHERE `id` > 477422 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002722s ]
  13. SELECT * FROM `article` WHERE `id` < 477422 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007604s ]
  14. SELECT * FROM `article` WHERE `id` < 477422 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010455s ]
  15. SELECT * FROM `article` WHERE `id` < 477422 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005156s ]
0.271213s