The importance of growth rates versus productivity levels.

Consider two economies, A and B. Both economies are described by the model in Section 8.3, having a population growth function similar in form to that in Figure 8.6. You know that the population growth function’s peak is at L*/L = 0.02, or 2% per year. Both economies start with a productivity level of B = 1. In economy A, productivity grows at 0.5% per year for 1000 years. In economy B, productivity is stagnant at B = 1 for 800 years. Then, for the next 200 years productivity grows at the rate 2.5% per year.

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