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In this case you would be looking at the Economics book, then the reading “Aggregate Output, Prices & Economic Growth” (which in this case is Reading 17)…..then within this Reading you will note that it is broken into sections….go to section 2 (in this reading it starts on page 208, titled “Aggregate Output and Income”)….then the “.1.2” refers to sections within this section of the reading… In this case the part you are looking for is section 2.1.2, which starts on page 214 (Nominal and Real GDP).