The opportunity cost of making this decision is 4 fish.
Opportunity cost is a term to refer to the cost of the alternative that we give up when we make a certain decision, including the benefits that we could have obtained by choosing the alternative option.
Based on the above, we can infer that the opportunity cost of this country is 4 fish because it is going to give up its current production alternative of 6 coconuts and 4 fish to switch to one with 8 coconuts and 2 fish.
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