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。 2023 Pearson Education Canada Inc. The Great Depression and the Collapse of Investment 7 169。 2023 Pearson Education Canada Inc. Role of Government 8 169。 2023 Pearson Education Canada Inc. Analysis of Figure 235: Role of Government ?G = + 400, ? T = + 400 1. With no G and T, Yd = C + I = 500 + mpc ??Y = 500 + .5Y, Y1 = 1000 2. With G, Y= C + I + G = 900 + .5Y, Y2 = 1800 3. With G and T, Yd = 900 + mpc ??Y – mpc ??T = 700 + .5Y, Y3 = 1400 Conclusions: 1. G ? Y ?。 T ? Y ? 2. ?G = ?T = + 400, Y ? 400