490 18-6 v的 Why the Aggregate-Demand Curve Is Downward Sloping The Price Level and Consumption:The Wealth Effect (Arthur Pigou (1877-1959):) The Price Level and Investment:The Interest Rate Effect The Price Level and Net Exports:The Exchange- Rate Effect Economics ECONOMICS MANAGEMENT SCHOOL,TONGJI UNIVERSITY Economics ECONOMICS & MANAGEMENT SCHOOL, TONGJI UNIVERSITY 18-6 Why the Aggregate-Demand Curve Is Downward Sloping • The Price Level and Consumption: The Wealth Effect（（Arthur Pigou（1877-1959)：） • The Price Level and Investment: The Interest Rate Effect • The Price Level and Net Exports: The Exchange￾Rate Effect