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15. Consumption Matrix 0.2 0.4 0.4 A = 0.4 0.2 0.2 0.4 0.2 0.2 (a) Find the production vector x when the external demand vector is 80 d = 120 100 (b) What change occurs in the production vector when the external demand in the first sector increases by one? (c) If the third sector's external demand increases by one, what change occurs in the production vector