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[Joseph_E._Stiglitz,_Carl_E._Walsh]_Economics(Bookos.org) (1)

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economy has in the future, thereby lowering full-employment income in the future.

When we discuss economic growth and productivity in Chapter 27, we will consider

some types of government expenditures and taxes that might affect the discovery

of new technologies, the productivity of capital, and the demand for labor by

firms. When we deal with these policies, we will need to investigate their impact on

potential GDP.

LEAKAGES AND INJECTIONS

We have focused our discussion of government deficits on the capital market. Recall,

however, that when the capital market is in equilibrium, balancing national saving

and investment, the leakages and injections in the circular flow of income will also

be balanced. This result holds just as it did in Chapter 24 when we ignored the government

sector. Leakages from the spending flow now consist of household saving

and taxes, while injections into the spending flow consist of investment and government

expenditures. As they adjust to ensure that national saving equals investment,

real interest rates also ensure that leakages equal injections at full-employment

output. The total demand for the goods and services produced by firms will balance

the total output that is produced at full employment.

Adding Government Incorporating the government into our model gives us

three sources of aggregate demand—consumption, investment, and government

purchases:

demand = C + I + G.

For the economy to be at equilibrium at full employment, demand must equal fullemployment

income. When the capital market is in equilibrium, desired investment

equals national saving (the sum of private saving and government saving). Private

saving at full employment is equal to full-employment income Y f minus consumption

and taxes. Government saving is equal to taxes minus expenditures. We can

express capital market equilibrium as

Rearranging this expression implies that

I = S N = S p + S g = (Y f − C – T) + (T – G).

C + I + G = Y f ,

which is to say that demand from consumption spending, investment, and government

spending equals full-employment income. Thus, aggregate demand equals fullemployment

output and the product market is in equilibrium at full employment

when the capital market is in equilibrium.

554 ∂ CHAPTER 25 GOVERNMENT FINANCE AT FULL EMPLOYMENT

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