This learning resource is designed for students to reflect on fundamental concepts from Chapter 1 of their Economics curriculum. The activities presented focus on applying key ideas such as scarcity, opportunity cost, sunk cost, and marginal analysis through a practical scenario involving a bake sale fundraiser. Students will analyze costs and benefits related to their decisions, particularly considering sunk costs and the rational choice theory to evaluate whether extending the sale by an additional hour is economically justified. By engaging with this material, students will deepen their understanding of economic principles and their application in real-world situations.