given that supply (y = c + s + t) equals demand (Y = C + I + G + X - M) and that private savings (S) equals domestic investment (i), explain how the

given that supply (y = c + s + t) equals demand (Y = C + I + G + X - M) and that private savings (S) equals domestic investment (i), explain how the government budget deficit must equal the trade deficit. use equations and show a step by step derivation of your solution