Assess students' ability to analyze how shifts in supply and demand and simple price controls (ceilings and floors) change equilibrium price and quantity in a lemonade-stand market. Tasks include reading and drawing supply/demand graphs, predicting direction and relative magnitude of changes, identifying shortages and surpluses under price controls, solving short numerical examples, and explaining effects on buyers' and sellers' welfare. Designed for Grade 6–8 as a challenging analytical assessment.