Sources of increasing returns that help raise productivity growth include the following, except:

High-income families pay a significantly greater percentage of their income in taxes compared to low-income families.

Answer the following statement true (T) or false (F)

In the macroeconomy, demand-side shifts change:

A. aggregate demand only, which is why the price level remains unaffected in the long run. B. only the output level in the long run, while prices eventually return to their long-run potential levels. C. only the price level in the long run, while output eventually returns to its long-run potential level. D. aggregate demand only, which eventually shifts back in the long run.