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6. a) Describe in words ONE fully labeled figure with two production possibilities frontiers or curves for an economy, one for year 1997, the other for year 2017. OR a) Draw IN ONE fully labeled figure two production possibilities frontiers or curves for an economy, one for year 1997, the other for year 2017. hi. i) Did the curve for 2017 shift outward? ii) If so, what are the four possible factors that may have caused this shift? iii) What are these factors collectively called