MCQOPTIONS
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				| 1. | 
                                    _ The shape of PPC is concave due to$? | 
                            
| A. | Falling opportunity cost between two goods | 
| B. | Rising opportunity cost between two goods | 
| C. | Constant opportunity cost between two goods | 
| D. | None of the above | 
| Answer» C. Constant opportunity cost between two goods | |