Use the production possibilities model and diagrams to show how the following can result in economic growth (positive or negative), distinguishing between PPC shifts and movements of a point closer to or further from a given PPC: (a) a discovery of new oil reserves (b) a fall in natural unemployment (c) an increase in cyclical unemployment (d) an improvement in levels of health of the population (e) an improvement in productive efciency (f) the widespread use of a new technology