Many options.

Option 1: “we won’t trade humans as slaves at all costs, even if it makes us less competitive in the global market - and we don’t hold that conviction about other things”

Option 2: “We won’t trade slaves - and if we find you trading slaves we will kill you. So we don’t have to worry about competing against slaves in the global marketplace.”

Option 3: “slavery is less efficient than having the same people as market participants - so I don’t consider giving up slaves to be less competitive”

Many more options, and mixtures of any or all of them.