For each of the following events, describe the likely effect on the country's production possibilities bound- ary (PPB). Start with a PPB like the one below and draw the likely change. "In each case, specify the appropriate labels for both axes in the diagram." a. Suppose the country has a 10-year civil war that destroys much of its infrastructure. b. Suppose a small country produces only food and clothing. A new agricultural technology is then introduced that doubles the amount of food that can be produced per year. c. Suppose a small country produces only food and clothing. An earthquake destroys many of the clothing factories, but the ability to produce food is unaffected. d. The country admits approximately 250 000 immi- grants each year, many of whom join the labour force.