Multiple choice need help

1. Suppose the quantity demanded of cigarette cartons falls by 5% when prices are increased by 100%. The price elasticity of demand for cigarettes is a. elastic and equal to 0.05. b. inelastic and equal to 0.05. c. elastic and equal to 20. d. inelastic and equal to 20. 2. Economists generally assume a. individuals act strictly in the public interest. b. individuals are never concerned with the interests of other people. c. individuals rarely promote the projects in which they are interested. d. none of the above. 3. A woman who decides to drive to work rather than take the bus a. lis wasting scarce resources. b. is behaving inefficiently. c. thinks driving is more economically efficient for her. d. is probably paying attention to personal comfort and convenience rather than economic efficiency. 4. Positive externalities are created by people when they a. add to the net real income of society. b. benefit others without intending to do so. c. increase the general welfare. d. promote the happiness of others