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PPC is the production possibility curve in country T.

Which changes take place in country T’s opportunity costs of producing X as it increases production of X?

1 ) 

Opportunity costs are constant between points 1 and 2, and between points 3 and 4.

2 ) 

Opportunity costs decrease between points 1 and 2, and increase between points 3 and 4.

3 ) 

Opportunity costs decrease between points 1 and 2, and between points 3 and 4.

4 ) 

Opportunity costs increase between points 1 and 2, and between points 3 and 4.

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