What are the six categories of exogenous shocks to growth, and can some shocks actually be POSITIVE for long-run output?

Question

AcadiFi · Accepted Answer

The curriculum identifies six categories of exogenous shocks. Importantly, most can be either growth-enhancing or growth-diminishing depending on the specific event.

```mermaid
flowchart TD
    A[Six Categories of
Exogenous Shocks] --> B[1. Policy Changes]
    A --> C[2. New Products & Technology]
    A --> D[3. Geopolitics]
    A --> E[4. Natural Disasters]
    A --> F[5. Natural Resources]
    A --> G[6. Financial Crises]
    B --> B1[+ Pro-growth reforms
- Trade barriers]
    C --> C1[+ Always positive
for potential growth]
    D --> D1[+ Peace dividend
- Resource diversion to military]
    E --> E1[- Short-run destruction
+ Possible long-run if rebuilding
uses better technology]
    F --> F1[+ New discoveries/fracking
- Supply disruptions/OPEC]
    G --> G1[- Always negative
for growth level and possibly trend]
```

**Category-by-Category Analysis:**

**1. Policy Changes:**
Pro-growth policies include: sound fiscal policy, minimal private-sector intrusion, competition encouragement, infrastructure and human capital investment, sensible tax policy.

| Direction | Example | CME Impact |
|---|---|---|
| Positive | Major corporate tax reform reducing effective rates | Raise trend earnings growth, increase equity return estimates |
| Negative | Erecting significant trade barriers | Reduce trend growth through inefficient resource allocation |

**2. New Products and Technologies:**
This is the only category that is essentially always positive for potential growth. Creation and adoption of new technologies expands the production possibility frontier.

| Example | CME Impact |
|---|---|
| Internet/e-commerce adoption | Raised productivity growth by ~1% per year in the late 1990s-2000s |
| AI/machine learning integration | Potentially raising productivity growth; magnitude still uncertain |

**3. Geopolitics:**
Conflict diverts resources to unproductive uses (weapons, military operations), discourages beneficial trade, and creates uncertainty. But geopolitical resolution can release resources and stimulate growth.

| Direction | Example | CME Impact |
|---|---|---|
| Positive | Fall of Berlin Wall → peace dividend, defense spending cuts | Freed government budgets for productive investment |
| Negative | Major regional conflict disrupting trade routes | Raise risk premiums, reduce growth forecasts |
| Mixed | Space race tensions → innovation spillovers | Short-term resource diversion but long-term technology gains |

**4. Natural Disasters:**
Destroy productive capacity in the short run. But intriguingly, long-run growth may actually benefit if old, inefficient capacity is replaced with modern facilities.

| Time Horizon | Effect | Mechanism |
|---|---|---|
| Short-run (0-2 years) | Negative | Destruction of capital stock, supply disruption |
| Long-run (5-20 years) | Potentially positive | Rebuilding with better technology, modern infrastructure |

**5. Natural Resources/Critical Inputs:**
Discoveries or new extraction methods (like hydraulic fracturing) enhance growth through direct production and by reducing input costs. Supply restrictions do the opposite.

| Direction | Example | CME Impact |
|---|---|---|
| Positive | US shale revolution (2008-2020) | Reduced energy costs, boosted US manufacturing competitiveness, raised US trend growth |
| Negative | 1973 OPEC oil embargo | Quadrupled oil prices, triggered stagflation, reduced trend growth |

**6. Financial Crises:**
The financial system channels resources to efficient use. When it breaks down, the damage extends beyond the immediate crisis — it can permanently reduce both the level of output and the trend growth rate.

The 2008-09 GFC illustrated both effects: US real GDP dropped ~4% (level effect) and trend growth appeared to downshift from ~3% to ~2% (growth rate effect). The level loss was never recovered — the economy resumed growing from a lower base at a slower rate.

**Key Exam Insight:** The curriculum emphasizes that truly exogenous shocks are NOT priced into asset values in advance (though general risk is). This means shocks create both danger (unexpected losses) and opportunity (mispriced assets after overreaction).

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What are the six categories of exogenous shocks to growth, and can some shocks actually be POSITIVE for long-run output?

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Practice Questions

Direction	Example	CME Impact
Positive	Major corporate tax reform reducing effective rates	Raise trend earnings growth, increase equity return estimates
Negative	Erecting significant trade barriers	Reduce trend growth through inefficient resource allocation

Example	CME Impact
Internet/e-commerce adoption	Raised productivity growth by ~1% per year in the late 1990s-2000s
AI/machine learning integration	Potentially raising productivity growth; magnitude still uncertain

Direction	Example	CME Impact
Positive	Fall of Berlin Wall → peace dividend, defense spending cuts	Freed government budgets for productive investment
Negative	Major regional conflict disrupting trade routes	Raise risk premiums, reduce growth forecasts
Mixed	Space race tensions → innovation spillovers	Short-term resource diversion but long-term technology gains

Time Horizon	Effect	Mechanism
Short-run (0-2 years)	Negative	Destruction of capital stock, supply disruption
Long-run (5-20 years)	Potentially positive	Rebuilding with better technology, modern infrastructure

Direction	Example	CME Impact
Positive	US shale revolution (2008-2020)	Reduced energy costs, boosted US manufacturing competitiveness, raised US trend growth
Negative	1973 OPEC oil embargo	Quadrupled oil prices, triggered stagflation, reduced trend growth