According to the text, paper money probably first evolved from

The MPC is 0.90 and there are no income taxes or imports. If government expenditures on goods and services increases by $2.0 billion, after the multiplier effect works out, aggregate expenditure increases by

A) $2.22 billion. B) $2.0 billion. C) $10 billion. D) $20 billion. E) $1.8 billion.

Among the causes of an increase in labor demand is ________

A) improved availability and affordability of day care for children B) an increase in enrollment at colleges C) an increase in the college wage premium D) an expansion of economic activity