Large differences in capital per worker lead to relatively small differences in predicted GDP across countries because there is diminishing returns to capital and and more capital person does not increase the GDP.
The model has only considered total (aggregate) output, while the wellbeing of a nation is based on output per individual. Although not everyone works, the production model assumes that there are an equal number of workers and people. Economists frequently discuss output per worker when talking about how well the production process is working. Since this measure is more closely tied to consumption per person in the economy, they use output per capita to convey some idea of economic welfare. When the productivity parameter and the amount of capital per person are higher, the output per person tends to be as well. That is why large differences in capital per worker lead to relatively small differences in predicted GDP across countries.
A monetary indicator of the market worth of all the finished goods and services produced in a nation over a given time period is called the gross domestic product (GDP).
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