Assess students' understanding of how supply and demand determine prices and influence consumer choices in a local market. Tasks include defining supply, demand, and equilibrium; interpreting simple supply/demand graphs and shifts; predicting price and quantity changes in short real-life scenarios (e.g., farmers' market, school store); and explaining how price changes affect buying decisions and basic trade-offs (introductory elasticity). Appropriate for grades 6–8, medium difficulty, requiring brief calculations and written explanations.