The aggregate demand curve slopes: downward in part because when the price level falls, the real wealth of the public falls, and this induces people to change their consumption. downward for the same reasons that an ordinary demand curve does. downward in part because as the price level falls, the ability of households and firms to borrow cheaply increases. upward, unlike an ordinary demand curve.

Which one of the following statements is true? ddt does not prevent disease from passing from agricultural animals to humans. cost was a major factor in the united states government's decision to ban ddt. many african governments concluded that the potential long-term health effects of ddt were not as serious as the immediate problem of insect control. ddt cannot accumulate in the fat of animals. the ddt ban in the united states has made it very difficult to control agricultural insect pests.