--%>

Explain Product Market Equilibrium.

To begin with, let us recall our three-sector product-market equilibrium model given as 

C + I + G = C + S + T


To this three-sector model, we now add the foreign trade-the exports (X) and imports (M). with the addition of X and M, the four-sector product-market equilibrium condition is written as 

C + I + G + (X - M) = C + S + T 

The variables X and M need some explanation and quantification exports (X) of a country depend on a variety of factors governing the foreign demand for its goods and services. The inclusion of foreign demand parameters in the domestic model of a country is neither an easy task nor a necessity for a simplified model. Therefore, X is assumed to be a constant factor, that is,

X = X

As regards imports, imports (m) of a country are a function of a number of factors, however, for the sake of analytical simplicity; imports are treated as the function the country's national income(Y). That is import function takes the following form

M = + mY

Where, M is autonomous import and m is marginal propensity to import, the proportion of marginal national income spent on imports.

With and defined, the four- sector product-market equilibrium condition given in can be rewritten as 

C+ I + G + X - M - mY = Y = C + S + T 

The product-market equilibrium condition can also be expressed as 

Y = C + I + G + X - M - mY

Where C = a + by d( where Yd = Y - T = disposable income)

S = - a + (I - B) y (where I - B = mps)

I = I - Hi (where h > 0) 

G = G, (where G is constant)

T =T + t y, (where T is constant tax and t is tax rate <1)

By substituting the equilibrium level of income can be expressed as

Y = a + b [Y - (T + t Y)] + I - hi + G +X - M - my

=a + by - b t - bty + I - hi + G + X - M - my 

Y = 1 / 1-b+ bt + m (a - b T + I - hi + G + X - M

Y = 1 / 1 - b (1 - t) +m (a - b T + I - hi + G + X - m 


Note that the term 1/ (1 - b + bt + m) is tax-trade multiplier which may be redesignated as mu. Also let us designate the sum of the five constants, viz a, i. G, X, and M as A. by substitution these value 

Y = mu (a - b T - hi)

(Where mu is tax-trade multiplier and A = a + I + G + X - M)

Equation  gives the aggregate demand (AD) function in a four-sector model. 

   Related Questions in Macroeconomics

  • Q : Help The demand for a resource will

    The demand for a resource will increase if the

  • Q : Supply of foreign currencies into

    What are the main sources of supply of foreign currencies into domestic economy? Answer: A) Foreigners purchasing home country’s goods and services via exports. B) Foreign investment in home country via

  • Q : Long-term Federal government budget

    Question: Explain why there are long-term Federal government budget problems.   Explain why the base-line forecast of the CBO is misleading. Include in your answer why solutions to the problem will necessarily involve a decision about which

  • Q : Nations wealth Adam Smith disputed that

    Adam Smith disputed that a nation’s wealth is, not the gold it possesses, but instead its: (1) Total population. (2) Capability to offer goods for its people. (3) Domestic financial capital. (4) Foreign investments. (5) Military might.

  • Q : Consumer Surplus definition Can someone

    Can someone help me in finding out the right answer from the given options. The basic difference between the dollar amounts people would willingly to pay for a particular quantity of a good and the amounts that they do pay at a particular market price is termed as: (1

  • Q : National disposable income What must be

    What must be added to NNPMP to obtain net national disposable income? Answer: The Net current transfers from abroad must be added to NNPMP to get national disposabl

  • Q : Define Devaluation Devaluation means

    Devaluation means decrease in the external value of a country’s currency as an aware policy measure adopted by the Government of a country. In another words, we make our currency less costly in terms of foreign currency. This builds our goods ch

  • Q : Paradox of Value-total utility and

    I have a problem in economics on Paradox of Value-total utility and marginal utility. Please help me in the following question. Water is more precious than diamonds when measured by _____, however less valuable when measured by _____. (i) Total cost, total benefit. (i

  • Q : From the heterodox approach From the

    From the heterodox approach, what options does the enterprise have to produce more output? What impact do these options have on its cost structure?

  • Q : The European debt crisis Quetion:

    Quetion: Describe the present economic crisis situation in Europe.   Why has it been so difficult for the Europeans to find a solution to this problem?   Comment on what implications the crisis may have for the rest of the