The article reviews how international trade is represented in economic models and suggests ways to improve them. It looks at how these models are used to study topics like trade agreements, wage changes, and climate adaptation. The researchers focus on a common trade model called the Armington specification, discussing its strengths and weaknesses. They also explore newer trade theories and how they can enhance the accuracy of these models. Overall, the paper aims to enhance the understanding of international trade dynamics and provide better tools for policymakers to make informed decisions.