The diagram represents the production possibilities of two economies X and Y.
As a result of soil erosion in economy X, the production possibility curve shifts from X to ${X_1}$.
According to the law of comparative advantage, what should country Y do following this change?

cease to trade with country X
2 )
export agricultural goods to country X
3 )
export manufactured goods to country X
4 )
import both agricultural and manufactured goods from country X
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