Final answer:
Government budget deficits can affect output in an economy. An increase in government spending (g) increases output (y), while an increase in taxes (t) decreases output (y). The impact of changes in g and t on output depends on the government budget constraint equation (3.8).
Step-by-step explanation:
In macroeconomics, to determine the impact of changes in government spending (g) and taxes (t) on output (y), we need to look at the government budget constraint equation (3.8). The equation states that a change in the budget deficit (g - t) affects either private savings (s), private investment (I), or the trade balance (TB) in an economy.
a. To find out the impact of an increase in government spending (g) by one unit, we would need to analyze equation (3.8) and see how it affects output (y).
b. Similarly, to determine the impact of an increase in taxes (t) by one unit, we would need to analyze equation (3.8) and see how it affects output (y).
c. The answers to (a) and (b) are different because an increase in government spending (g) directly adds to aggregate demand, which positively affects output (y). On the other hand, an increase in taxes (t) reduces private income, leading to a decrease in consumption and therefore a decrease in output (y).
Example: If government spending (g) increases by $100 billion and the multiplier effect is 2, it would result in an increase in output (y) by $200 billion. On the other hand, if taxes (t) increase by $100 billion and the multiplier effect is 2, it would lead to a decrease in output (y) by $200 billion.