Select at least two news articles that discuss demand, supply, and equilibrium price of two substitute products, like beef and chicken; butter and margarine. It can be two articles that discuss both products, or one article about one product and another article about another product. Demand for one product: Quantity demanded, Determinants of demand, Shifts in demand curve, etc. Demand for another product: Quantity demanded, Determinants of demand, Shifts in demand curve, etc. Supply for one product: Quantity supplied, Determinants of supply, Shifts in supply curve, etc. Supply for one product: Quantity supplied, Determinants of supply, Shifts in supply curve, etc. Changes in equilibrium quantity and equilibrium price for one product Changes in equilibrium quantity and equilibrium price for another product.