Which is true regarding the absorption approach?

Question

BlackTom AI · Accepted Answer

The absorption approach expresses the trade balance as the difference between national output (Y) and domestic absorption (A = C + I + G), so net exports NX = Y - A.

1. Relevant concepts
- National income accounting: output Y equals consumption (C) + investment (I) + government spending (G) + net exports (NX). Rearranged, NX = Y - (C + I + G).
- Absorption: total domestic expenditure A = C + I + G.
- Policy implication: changes in NX after a currency depreciation depend on how much Y changes relative to A.

2. Step-by-step reasoning
- Start from identity: NX = Y - A.
- Differentiate to see the effect of any shock (e.g., depreciation): dNX = dY - dA.
- Therefore, a policy or shock improves the trade balance (dNX > 0) only if the induced increase in output exceeds the increase in domestic absorption.

3. Intermediate/calculation example
- Suppose initially Y = 100, A = 98, so NX = 2.
- After depreciation, suppose Y rises to 110 (dY = +10) but absorption rises to 105 (dA = +7). Then dNX = 10 - 7 = +3, so NX = 5 (trade balance improves).
- If absorption rose by 12 instead (dA = +12), then dNX = 10 - 12 = -2, NX falls to 0 (trade balance worsens).

4. Why the correct answer is correct
- The absorption approach precisely “highlights the relationship between net exports and all the other components of production” because it rewrites NX as the residual of output minus domestic spending, emphasizing how consumption, investment and government spending determine the trade balance given output.

5. Why the other options are incorrect
- “It provides another reason why a depreciation may improve a trade deficit.” This is a possible implication but not the defining statement; the absorption approach shows the mechanism and condition (dY > dA) rather than simply being “another reason.”
- “It contradicts the conclusions of the elasticity approach.” False: the absorption approach is complementary, not a blanket contradiction; they focus on different mechanisms (aggregate spending vs. price elasticities).
- “all of these” is therefore incorrect because not all listed statements are true.

6. Conclusion
- The correct choice is: It highlights the relationship between net exports and all the other components of production. This matches the provided answer.

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