What do the different yield curve shapes mean and how do I interpret them for the exam?

Question

AcadiFi · Accepted Answer

The yield curve plots bond yields (Y-axis) against maturity (X-axis) for same-credit-quality instruments, typically government bonds. Its shape carries powerful economic signals.

```mermaid
graph LR
  subgraph Normal Yield Curve
    direction LR
    N1[3M: 3.0%] --> N2[2Y: 3.8%] --> N3[5Y: 4.3%] --> N4[10Y: 4.7%] --> N5[30Y: 5.0%]
  end
  subgraph Inverted Yield Curve
    direction LR
    I1[3M: 5.2%] --> I2[2Y: 4.8%] --> I3[5Y: 4.3%] --> I4[10Y: 3.9%] --> I5[30Y: 3.7%]
  end
  subgraph Flat Yield Curve
    direction LR
    F1[3M: 4.2%] --> F2[2Y: 4.2%] --> F3[5Y: 4.3%] --> F4[10Y: 4.3%] --> F5[30Y: 4.3%]
  end
```

**1. Normal (Upward-Sloping)**

The most common shape. Short-term yields are lower than long-term yields. This reflects:
- **Term premium:** Investors demand higher compensation for locking money away longer (more interest rate risk, more inflation uncertainty).
- **Economic signal:** The economy is expected to grow at a healthy pace. Central bank policy rates are moderate, and inflation expectations are stable.

**Example:** In mid-2024, the US curve was: 3-month T-bill at 5.3%, 2-year note at 4.7%, 10-year note at 4.3% — this was actually still partially inverted.

**2. Inverted (Downward-Sloping)**

Short-term yields exceed long-term yields. This signals:
- The market expects the central bank to **cut rates** in the future because the economy is slowing.
- Investors are rushing into long-term bonds as a safe haven, pushing long-term yields down.
- **Recession predictor:** An inverted 2y/10y spread has preceded every US recession since 1970 with a 12-18 month lead time.

**3. Flat**

Yields are roughly the same across maturities. This typically occurs during **transitions** — either from normal to inverted (economy peaking, Fed tightening) or from inverted back to normal (economy recovering).

**4. Humped**

Mid-term yields (2-5 years) are highest, with both short and long ends lower. This is rare and usually reflects conflicting expectations — perhaps tight monetary policy now but expected rate cuts and low growth further out.

**Three Theories Explaining the Curve:**

| Theory | Key Idea | Implication |
|---|---|---|
| Pure Expectations | Forward rates = expected future spot rates | Shape driven entirely by rate expectations |
| Liquidity Preference | Investors demand premium for longer maturities | Curve biased upward even if rates expected flat |
| Market Segmentation | Supply/demand in each maturity segment sets yields | Shape can be any form depending on institutional demand |

**Exam Tip:** Under the **pure expectations hypothesis**, a normal curve means the market expects rates to rise. Under **liquidity preference**, a normal curve can exist even if rates are expected to stay flat — the upward slope simply reflects the term premium. The exam will ask you to distinguish these interpretations.

**Practical Application:** If you see a portfolio manager shifting from long to short duration, they likely expect rates to rise (or the curve to flatten from the long end). Duration management is the primary tool for positioning along the curve.

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What do the different yield curve shapes mean and how do I interpret them for the exam?

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