The document outlines a unit task that asks students to advise the Afghan government on how to incentivize farmers to stop growing opium and instead produce alternative crops. Students will analyze the costs and incentives facing individual opium farmers from the perspective of various economic actors. They will develop a model of a perfectly competitive opium farmer and explain how changing production costs could influence farmers' crop choices. The unit will incorporate concepts taught all semester regarding economics, markets, and government intervention to address market failures and negative externalities. Assessment will include formative discussions, practice AP questions, and summative group presentations and essays.