Now lets put it all together. Using Supply and Demand. Supply And Demand Intelligent Economist Diagram Graphing Marketing Jobs Read more shows how the product prices and the demand for those items are related. . If supply remains the same and demand increases then price increases. Since decreases in demand and supply considered separately each cause equilibrium quantity to fall the impact of both decreasing simultaneously means that a new equilibrium quantity of coffee must be less than the old equilibrium quantity. Tus demand and supply both are equal at rs3. Cost of production if it increases supply decreases. For example if the price of a computer is expected to fall next month the demand for computers today decreases. The law of supply and demand is the theory explaining the interaction between the supply of a resource and the demand for that resource. While plotting figures for the supply and demand c...