Which currency is normally used for conducting global trade between two countries? currency of the seller
currency of the buyer
currency of a third country
currency of the stronger country

Often times the currency used is the currency of the seller.

currency of the stronger country

Explanation:

International trade contracts between two countries are usually made in the currency of the country that has the largest hegemony of the world economy, in this case the US. Most contracts between two countries, even when the US is not theirs, are made in dollars. The dollar has become a standard currency for international trade contracts. For example, contracts between Brazil and China are traded in dollars.

This is not a rule, but it is usually so, except in some economic blocs, such as the European Union, where the Euro is the current currency of contracts.

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