Test students' ability to analyze how shifts in supply and demand, changes in pricing, production costs, and advertising influence profit and market equilibrium for a small business (lemonade stand or school snack shop). Students will interpret supply/demand graphs, calculate new equilibrium price and quantity, compute profit changes from cost and price adjustments, and explain short-run vs. long-run outcomes using both quantitative calculations and written reasoning; scenarios may include ingredient cost increases, a successful ad campaign, price cuts, or new competitors.