The difference between production possibilities frontiers that are bowed out and those that are straight lines is that, "Bowed-out production possibilities frontiers illustrate increasing opportunity cost, and straight line illustrate constant opportunity cost."
When the Production Possibilities Curve(PPC) is a straight line, opportunity costs are the same no matter how far you move along the curve.
When the Production Possibilities Curve(PPC) is concave, bowed out, opportunity costs increase as you move along the curve. Whereas, straight line illustrate constant opportunity cost.
Hence, the answer was given and explained above.
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