Foundation of justice, is good faith

Cicero [106 BC – 43 BC] wrote that the “foundation of justice, is good faith [fides], in other words truthfully abiding by our words and agreements.” On Obligations: I.23, Peter G. Walsh trans., OUP 2000.
Critically analyse and evaluate mechanisms by which international trade law nurtures as well as requires parties to abide by their contractual obligations.
You may select which aspects of international trade to address in your answer, but are advised to consider more than one.