Which of the following best explains the source of increases in productivity?ResponsesA increases in money supplyincreases in money supplyB increases in populationincreases in populationC increases in aggregate demandincreases in aggregate demandD increases in capital per worker

The best explanation for the source of increases in productivity is D: increases in capital per worker.

Here's why:

A) Increases in money supply: While this can stimulate economic activity in the short term, it doesn't necessarily lead to increased productivity. In fact, if the money supply grows too quickly, it can lead to inflation, which can harm economic productivity.

B) Increases in population: A larger population can lead to a larger labor force, which can increase total output. However, this doesn't necessarily mean productivity (output per worker) will increase. In fact, if the population grows faster than the economy, productivity could decrease.

C) Increases in aggregate demand: This can stimulate economic activity and could lead to increased productivity in the short term. However, in the long term, productivity is more influenced by supply-side factors such as technology and capital.

D) Increases in capital per worker: This is the best answer. When workers have more capital (e.g., machinery, tools, software), they can produce more output for each hour of work. This is a direct increase in productivity.