Consider an economy described by the following equations:

y = c + i + g + nx,

y = 5,000,

g = 1,000,

t = 1,000,

c = 250 + 0.75(y – t),

i = 1,000 – 50r,

nx = 500 – 500e,

r = r* = 5.

a. in this economy, solve for national saving, investment, the trade balance, and the equilibrium exchange rate.

b. suppose now that g rises to 1,250. solve for national saving, investment, the trade balance, and the equilibrium exchange rate. explain what you find.

a. exchange rate = 1

b. exchange rate = 1.5

Explanation:

(a)  National Saving = Private saving + public saving

Private saving = Y - C - T

=> Private saving = 5000 - (250 + 0.75(Y – T)) - 1000

=> Private saving = 5000 - (250 + 0.75(5000 – 1000)) - 1000 = 750

Public saving = T - G = 1000 - 1000 = 0

National saving = 750 + 0

= 750

Investment = 1000 - 50r = 1000 - 50*5

= 750

Y = C + I + G + NX

Trade Balance = Y - C - G - I = 5000 - (250 + 0.75(5000 – 1000)) - 1000 - 750 = 0

Thus Trade Balance = 0

NX = 0 => NX = 500 – 500e = 0

=> e = 1

Thus exchange rate = 1

(b)

National Saving = Private saving + public saving

Private saving = Y - C - T

=> Private saving = 5000 - (250 + 0.75(Y – T)) - 1000

=> Private saving = 5000 - (250 + 0.75(5000 – 1000)) - 1000 = 750

Public saving = T - G = 1000 - 1250 = -250

National saving = 750 - 250

= 500

Investment = 1000 - 50r = 1000 - 50*5

= 750

Y = C + I + G + NX

Trade Balance = Y - C - G - I = 5000 - (250 + 0.75(5000 – 1000)) - 1250 - 750 = -250

Thus Trade Balance = -250

NX = -250 => NX = 500 – 500e = -250

=> e = 750/500 = 1.5

Thus exchange rate = 1.5

metallurgy is your answer

the "study of metals and the process of refining ("

note that it says metal. metallurgy has the word "metal" in it, and so is most likely your answer (and is your answer).

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b. take periodic breaks and alternate between tasks.  

will increase work efficiency, and avoid health issues.