Economic growth is a sustained increase in potential output, shown as the long-run aggregate supply (LRAS) curve — and the production possibilities curve — shifting right. For living standards, growth is measured as rising real GDP per capita.
Growth is not recovery. Moving from inside the production possibilities curve back to the curve (closing a recessionary gap by rehiring idle workers) uses existing capacity. Growth builds new capacity. The business cycle wiggles around the trend; growth is the trend.
Because growth compounds, small differences in the annual rate become enormous over decades. The rule of 70 estimates the years to double: 70 ÷ the annual growth rate. An economy growing 2% a year doubles its output in about 35 years; at 3.5%, in about 20 years.
Productivity is output per worker (or per hour worked). Over the long run, living standards track productivity almost one-for-one. Productivity rises with:
Natural resources help but are neither necessary nor sufficient — resource-poor economies can thrive and resource-rich ones can stagnate.
New physical capital requires investment, and investment is financed by saving through the loanable funds market:
The core tradeoff: producing capital goods today means fewer consumer goods today but a larger production possibilities curve tomorrow.
| Policy | Mechanism |
|---|---|
| Tax incentives for saving and business investment | More loanable funds and investment → more capital per worker |
| Funding education and worker training | Human capital rises → productivity rises |
| Support for research, development, and patents | Technology advances |
| Public infrastructure investment | Public physical capital rises |
| Secure property rights and stable institutions | Raise the expected return to all private investment |
All of these shift LRAS right. Contrast this with demand-management policy (stimulus, rate cuts), which moves the economy toward its potential temporarily but does not move the potential itself.
[GRAPH: Economic growth in the aggregate demand-aggregate supply model
X-axis: Real GDP
Y-axis: Price level
Curves: LRAS1 vertical at potential output Yf1; SRAS1; AD1
Shift: capital accumulation and technology → LRAS1 shifts right to LRAS2
(vertical at Yf2 > Yf1), with SRAS shifting right alongside
Result: higher potential output; price level stable or lower depending on demand]
[GRAPH: The same story on the production possibilities curve
X-axis: Consumer goods
Y-axis: Capital goods
Curve: PPC1 shifting outward to PPC2
Note: an economy choosing a capital-rich point on PPC1 experiences a
larger outward shift than one choosing a consumption-heavy point]
1. C. Growth is a sustained rise in potential output and real GDP per capita — real, per-person, lasting. A: nominal gains can be pure inflation. B: that is recovery, using existing capacity. D: that is inflation. E: consumer spending is a demand component, not capacity.
Fix: Growth lives in "potential, real, per-capita" terms; all three words matter.
2. C. Growth moves the vertical long-run aggregate supply line to the right (with short-run supply following). A: demand expansion is temporary, not growth. B: you cannot move along a vertical curve to more output. D: that is inflation at full employment. E: a leftward supply shift is a cost shock, the opposite of growth.
Fix: If potential output changed, the LRAS line must visibly move right.
3. B. Productivity is output divided by workers (or hours). A: total output ignores the denominator. C: a count of inputs is not efficiency. D and E: not the definition.
Fix: Productivity is a ratio — output per worker; living-standard growth is growth in that ratio.
4. D. Skills training builds human capital embodied in people. A: trucks are physical capital. B: oil is a natural resource. C: money is nominal and does not build capacity. E: a machinery credit finances physical capital, not human capital.
Fix: Human capital = knowledge, skills, and health in workers, not machines or money.
5. E. Adding identical capital with fixed labor and technology yields less each time — diminishing returns. A: economies of scale would show falling average costs, not this setup. B: the multiplier is a demand-side idea. C: no borrowing or interest-rate story here. D: money neutrality is unrelated.
Fix: Capital accumulation alone hits diminishing returns; only technology resets the payoff.
6. A. Technology raises output at every capital level — the sustainable engine for rich economies. B: more identical capital runs into diminishing returns. C: money is neutral in the long run. D and E: trade deficits and confidence do not build capacity.
Fix: Poor economies grow by accumulating capital; rich economies must innovate.
7. D. Saving and investment incentives increase capital per worker, raising the growth rate. A and C: demand-side stimulus, temporary. B: a cushion, not a capacity builder. E: a price ceiling creates shortages, not capacity.
Fix: Growth policies work on saving, capital, skills, or ideas — not this quarter's spending.
8. A. Deficits raise real interest rates, crowding out private investment, which slows capital accumulation and long-run growth. B: deficits do not lower the natural rate. C: "too fast" is not a problem deficits cause. D and E: unrelated to the crowding-out channel.
Fix: Deficit → higher real rate → less investment → less capital tomorrow — the fiscal-to-growth link.
9. E. Per-capita growth is roughly output growth minus population growth: 5% − 2% = 3%. A: that adds them. B: population's own rate. C: ignores population. D: no basis.
Fix: Per-capita growth ≈ GDP growth − population growth.
10. B. More capital means more capacity: the production possibilities curve shifts out and long-run aggregate supply shifts right — the same fact on two graphs. A: recovery moves the point, not the frontier. C and D: demand and prices do not build capacity. E: transfers redistribute income, not capacity.
Fix: Anything that shifts one capacity graph shifts the other; they describe the same frontier.
11. B. Secure property rights make investment and innovation worth undertaking by raising expected returns — the precondition for accumulation. A: no guarantee of employment. C: institutions are not a monetary tool. D: no policy prevents all recessions. E: unrelated to the exchange rate.
Fix: Institutions set the incentive to invest; without them, no other growth policy works.
12. C. Restarting idle factories is recovery — the economy returns to an unchanged frontier — whereas growth means the frontier itself moves out. A and B: these conflate recovery with growth. D: output rising is exactly what recovery is. E: growth has no price-level requirement.
Fix: Ask "did potential change, or did we return to it?" — that separates growth from recovery.
1. C. Growth is a sustained rise in potential output and real GDP per capita — real, per-person, lasting. A: nominal gains can be pure inflation. B: that is recovery, using existing capacity. D: that is inflation. E: consumer spending is a demand component, not capacity. Fix: Growth lives in "potential, real, per-capita" terms; all three words matter.
2. C. Growth moves the vertical long-run aggregate supply line to the right (with short-run supply following). A: demand expansion is temporary, not growth. B: you cannot move along a vertical curve to more output. D: that is inflation at full employment. E: a leftward supply shift is a cost shock, the opposite of growth. Fix: If potential output changed, the LRAS line must visibly move right.
3. B. Productivity is output divided by workers (or hours). A: total output ignores the denominator. C: a count of inputs is not efficiency. D and E: not the definition. Fix: Productivity is a ratio — output per worker; living-standard growth is growth in that ratio.
4. D. Skills training builds human capital embodied in people. A: trucks are physical capital. B: oil is a natural resource. C: money is nominal and does not build capacity. E: a machinery credit finances physical capital, not human capital. Fix: Human capital = knowledge, skills, and health in workers, not machines or money.
5. E. Adding identical capital with fixed labor and technology yields less each time — diminishing returns. A: economies of scale would show falling average costs, not this setup. B: the multiplier is a demand-side idea. C: no borrowing or interest-rate story here. D: money neutrality is unrelated. Fix: Capital accumulation alone hits diminishing returns; only technology resets the payoff.
6. A. Technology raises output at every capital level — the sustainable engine for rich economies. B: more identical capital runs into diminishing returns. C: money is neutral in the long run. D and E: trade deficits and confidence do not build capacity. Fix: Poor economies grow by accumulating capital; rich economies must innovate.
7. D. Saving and investment incentives increase capital per worker, raising the growth rate. A and C: demand-side stimulus, temporary. B: a cushion, not a capacity builder. E: a price ceiling creates shortages, not capacity. Fix: Growth policies work on saving, capital, skills, or ideas — not this quarter's spending.
8. A. Deficits raise real interest rates, crowding out private investment, which slows capital accumulation and long-run growth. B: deficits do not lower the natural rate. C: "too fast" is not a problem deficits cause. D and E: unrelated to the crowding-out channel. Fix: Deficit → higher real rate → less investment → less capital tomorrow — the fiscal-to-growth link.
9. E. Per-capita growth is roughly output growth minus population growth: 5% − 2% = 3%. A: that adds them. B: population's own rate. C: ignores population. D: no basis. Fix: Per-capita growth ≈ GDP growth − population growth.
10. B. More capital means more capacity: the production possibilities curve shifts out and long-run aggregate supply shifts right — the same fact on two graphs. A: recovery moves the point, not the frontier. C and D: demand and prices do not build capacity. E: transfers redistribute income, not capacity. Fix: Anything that shifts one capacity graph shifts the other; they describe the same frontier.
11. B. Secure property rights make investment and innovation worth undertaking by raising expected returns — the precondition for accumulation. A: no guarantee of employment. C: institutions are not a monetary tool. D: no policy prevents all recessions. E: unrelated to the exchange rate. Fix: Institutions set the incentive to invest; without them, no other growth policy works.
12. C. Restarting idle factories is recovery — the economy returns to an unchanged frontier — whereas growth means the frontier itself moves out. A and B: these conflate recovery with growth. D: output rising is exactly what recovery is. E: growth has no price-level requirement. Fix: Ask "did potential change, or did we return to it?" — that separates growth from recovery.