**📅 Date:** ➤ ⌈[[2025-05-05-Mon〚Porter’s Five Forces ▪ HHI〛]]⌋
**📌 Time**: Review of[[2025-05-02-Fri〚 💰PESTLE Framework ▪ 👾Thoughts- Will Knowledge the Flavour Of Your Coffee〛|2025-05-02-Fri]]
**💭 Note:**
➤ a measure of market concentration|市场集中度-->competition
- A **higher HHI** indicates a **more concentrated market** — meaning fewer firms dominate and there’s less competition.
- A **lower HHI** suggests a **more competitive environment**.
➤
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**🏷️ Tags**: #💰/Economy
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# 📊 HHI - Herfindahl-Hirschman Index (赫芬达尔-赫希曼指数)
## 🧠 Summary
- HHI helps quantify how competitive a market is.
- High HHI = High concentration = Lower competition.
- Used in merger analysis and industry evaluation.
- Relevant for investors, regulators, and analysts.
## 📌 What is HHI?
The **Herfindahl-Hirschman Index (HHI)** is a measure of market concentration|市场集中度used to assess the **level of competition** in a market.
- A **higher HHI** indicates a **more concentrated market** — meaning fewer firms dominate and there’s less competition.
- A **lower HHI** suggests a **more competitive environment**.
## 🧮 How is HHI calculated?
**Formula:**
HHI = Σ (Market Shareᵢ)²
- Each firm’s market share|市场份额 is **expressed as a decimal** (e.g., 30% = 0.30).
- Then **square** each firm’s share and **sum** the values.
### 🧾 Example 1: Perfect Competition (均衡竞争)
Four firms each with 25% share:
HHI = 0.25² + 0.25² + 0.25² + 0.25² = 0.25
HHI (standard scale) = 0.25 × 10,000 = 2,500
### 🧾 Example 2: Monopoly (垄断)
One firm has 100% share:
HHI = 1.00² = 1.00
HHI = 10,000
## 📊 Interpretation
| **HHI Score Range** | **Market Type** | **Implication (含义)** | | |
| ------------------- | ------------------------------ | ---------------------------------------------------- | --------------- | -------------------- |
| 0 – 1,500 | Competitive (竞争型市场) | No dominant firm; healthy competition | | |
| 1,500 – 2,500 | Moderately concentrated (中度集中) | Some pricing power; risk of collusion (串谋) increases | | |
| > 2,500 | Highly concentrated (高度集中) | Risk of monopoly | 垄断 or oligopoly | 寡头; less competition |
## 🏛 Real-World Implication
- Used by **regulators (监管机构)** like the **US DOJ** and **FTC** to evaluate mergers.
- If a merger increases HHI by more than **200 points** in a **concentrated industry**, it may trigger an **antitrust review**.
- Investors (投资者) use HHI to:
- Assess **industry risk**
- Estimate **pricing power (定价权)**
- Forecast **regulatory challenges**
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### 一个新的创业公司 进入怎样赛道如何参考hhi
- 每个fouder的梦想是不一样的
- 有的founder是喜欢创造
- 在特别垄断性强的，会更喜欢偏于创造的，exit plan，大公司去buy you， you just focus on your ideals
- 如果产品愿景是做大做强做No.1 和google竞争成功几率较小