A theory of fairness in international trade should answer at least three questions.  What, at the basic level, are we to assess as fair or unfair in the trade context?  What sort of fairness issue does this basic subject of assessment raise?  And, What moral principles must be fulfilled if trade is to be fair in the relevant sense?  In this paper, I will offer answers to these three questions which derive from a broadly Rawlsian "constructivist" methodology.