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Consider preferences represented by utility functions: (POINTS: 10) u (x,y ) = xiyi uz(x, y) = min{4x, 3y} Imagine the aggregate endowment in this economy is (ex, ey) = (9, 12) Explain why the allocation (x1, y1) = (0,0) and (x2, y2) = (ex, ey) is Pareto efficient.