${R_1}{S_1},{\text{ }}{R_2}{S_2},{\text{ }}{R_3}{S_3}$ and ${R_4}{S_4}$ are production possibility curves (PPC) for four different countries 1, 2, 3 and 4.
Which statement about the opportunity cost of good R in terms of good S is not correct?
It is greater at all points on ${R_4}{S_4}$ than on ${R_3}{S_3}$.
2 )
It is greater in country 3 than country 2.
3 )
It is lower in country 2 than country 1.
4 )
It is the same at each point on ${R_3}{S_3}$.
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