经济学 (Economics)
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├── 🟢 Level 1: 经济学入门 — 什么是经济学？
│   ├── 经济学的定义与分支
│   ├── 稀缺性与选择
│   ├── 机会成本
│   ├── 经济学十大原理
│   └── 案例：为什么你选择了这份工作？
│
├── 🔵 Level 2: 供给与需求 — 市场如何运作？
│   ├── 需求定律与需求曲线
│   ├── 供给定律与供给曲线
│   ├── 市场均衡与价格机制
│   ├── 弹性（价格弹性、收入弹性、交叉弹性）
│   └── 案例：口罩价格为何在疫情中飙升？
│
├── 🟡 Level 3: 消费者与生产者理论 — 决策背后的逻辑
│   ├── 效用理论（边际效用递减）
│   ├── 无差异曲线与预算约束
│   ├── 生产函数与边际报酬递减
│   ├── 成本曲线（固定成本、可变成本、边际成本）
│   ├── 利润最大化条件
│   └── 案例：星巴克如何定价？
│
├── 🟠 Level 4: 市场结构与市场失灵 — 市场并非万能
│   ├── 完全竞争市场
│   ├── 垄断市场
│   ├── 寡头市场（博弈论初步）
│   ├── 垄断竞争市场
│   ├── 外部性（正外部性、负外部性）
│   ├── 公共物品与搭便车
│   ├── 信息不对称（逆向选择、道德风险）
│   └── 案例：为什么要反垄断？Google 案例分析
│
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│   ⬆ 微观经济学 (Microeconomics)
│   ⬇ 宏观经济学 (Macroeconomics)
│   ══════════════════════════════════════
│
├── 🔴 Level 5: GDP、通货膨胀与失业 — 衡量整体经济
│   ├── GDP 的概念与计算方法
│   ├── 名义 GDP vs 实际 GDP
│   ├── 通货膨胀与 CPI
│   ├── 失业的类型（摩擦性、结构性、周期性）
│   ├── 菲利普斯曲线
│   └── 案例：2008 年金融危机的冲击
│
├── 🟣 Level 6: 货币政策与财政政策 — 政府如何调控经济？
│   ├── 中央银行的角色与功能
│   ├── 货币供给与货币乘数
│   ├── 利率与货币政策工具
│   ├── 政府预算与财政政策
│   ├── IS-LM 模型简介
│   └── 案例：美联储加息如何影响全球？
│
└── ⬛ Level 7: 国际经济与经济增长 — 全球视野
    ├── 比较优势与国际贸易
    ├── 汇率与国际收支
    ├── 经济增长理论（Solow 模型）
    ├── 发展经济学基础
    └── 案例：中美贸易摩擦的经济学分析

Economics
│
├── 🟢 Level 1: Introduction — What is Economics?
│   ├── Definition & branches of economics
│   ├── Scarcity & choice
│   ├── Opportunity cost
│   ├── Ten Principles of Economics
│   └── Case: Why did you choose your current job?
│
├── 🔵 Level 2: Supply & Demand — How Markets Work
│   ├── Law of demand & demand curve
│   ├── Law of supply & supply curve
│   ├── Market equilibrium & price mechanism
│   ├── Elasticity (price, income, cross)
│   └── Case: Why did mask prices surge during COVID?
│
├── 🟡 Level 3: Consumer & Producer Theory — Logic Behind Decisions
│   ├── Utility theory (diminishing marginal utility)
│   ├── Indifference curves & budget constraints
│   ├── Production function & diminishing returns
│   ├── Cost curves (fixed, variable, marginal)
│   ├── Profit maximization
│   └── Case: How does Starbucks set its prices?
│
├── 🟠 Level 4: Market Structures & Failures — Markets Aren't Perfect
│   ├── Perfect competition
│   ├── Monopoly
│   ├── Oligopoly (intro to game theory)
│   ├── Monopolistic competition
│   ├── Externalities (positive & negative)
│   ├── Public goods & free-rider problem
│   ├── Information asymmetry (adverse selection, moral hazard)
│   └── Case: Why antitrust? The Google case
│
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│   ⬆ Microeconomics
│   ⬇ Macroeconomics
│   ══════════════════════════════════════
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├── 🔴 Level 5: GDP, Inflation & Unemployment — Measuring the Economy
│   ├── GDP concepts & calculation methods
│   ├── Nominal GDP vs Real GDP
│   ├── Inflation & CPI
│   ├── Types of unemployment (frictional, structural, cyclical)
│   ├── Phillips Curve
│   └── Case: The 2008 Financial Crisis
│
├── 🟣 Level 6: Monetary & Fiscal Policy — How Governments Manage the Economy
│   ├── Role & functions of central banks
│   ├── Money supply & money multiplier
│   ├── Interest rates & monetary policy tools
│   ├── Government budget & fiscal policy
│   ├── IS-LM Model introduction
│   └── Case: How Fed rate hikes affect the world
│
└── ⬛ Level 7: International Economics & Growth — A Global Perspective
    ├── Comparative advantage & international trade
    ├── Exchange rates & balance of payments
    ├── Economic growth theory (Solow Model)
    ├── Development economics basics
    └── Case: US-China trade tensions analysis