 consumer equilibrium and market demand. To understand consumer equilibrium one should have understanding about indifference curve and budget constraint. As already discussed indifference curve denotes different combination of two commodities that provide same level of satisfaction to a particular consumer. Similarly, budget constraint shows different combination of two commodities that a consumer can afford by using his limited income. Under consumer equilibrium our objective is to analyze how a consumer responds to a change in price and income. If prices of commodities changes, how equilibrium, how consumer choice will change because of change in price of commodities or because of change in income of the consumer. In fact equilibrium is a point where consumer is maximizing his satisfaction while facing the budget constraint. There is a change in equilibrium of the consumer because of change in prices of the commodities and income of the consumer. In fact consumers equilibrium ultimately helps us to find out demand for goods and services by individuals and on the basis of these individuals demand we in fact describe market demand. Consumers equilibrium in fact are the optimal choices of a particular consumer against given budget constraint. Optimal choice are those choice of the commodities where consumer is maximizing his satisfaction under his given income constraint. If we assume the prices of both commodities that are being used by a particular consumer decreases because of the decrease in prices of the commodities. There is increase in consumer satisfaction. Because of that decrease in the prices of the commodities, consumer can afford more of both commodities to maximize his satisfaction. Similarly if we assume prices of commodities remain constant and there is increase in income of the consumer. Because of that increase in income of the consumer affordability part of affordability of the consumer will increase and because of that increase in affordability of the consumer, consumer can purchase more of both commodities and there is a change in combination of commodities against which a consumer is achieving satisfaction. So we will understand concept of consumer equilibrium in detail in next few materials. Thank you very much.