Two countries produce the same goods for the same opportinity cost
II. Two countries produce different goods for different opportinity costs
III. Two countries are isolated by geography and politics
IV. Two countries have the same identical markets
What fact or facts support a situation where trade is disadvantageous?

I and III

Explanation:

Although there are many reasons why countries should trade, there are some situations in which trade between these countries are also considered disadvantageous.

Majorly, the opportunity cost a country has in producing a given good gives it a leverage when it goes into international trade with another country. Now, in situations where the two countries produce goods for same opportunity cost, then, trade is considered disadvantageous.

ALSO, the isolation of countries by geography or politics can also make international trade disadvantageous.