Consider the markets for tap water, bottled water, cola, and beer. Assume there is only one provider of tap water, bottled water manufacturers use advertising to differentiate their products, cola producers engage in strategic pricing behavior, and the beer market is largely controlled by only a few firms. Classify the market for each of the following drinks as either monopoly, oligopoly, monopolistic competition, or perfect competition. a. Tap water
b. Bottled water
c. Cola
d. Beer

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.