A production possibilities table for two products, grain and airplanes, is found below.Usual assumptions regarding production possibilities are implied.Grain is measured in tons and airplanes are measured in units of 1,000.
(a) Using the below graph construct a production possibilities curve from this information placing grain on the vertical axis and airplanes on the horizontal axis. 
(b) What is the opportunity cost of producing the first unit of airplanes? The marginal opportunity cost of producing the fourth unit of airplanes?
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