Explanation, analysis and understanding of subtopics, such as demand, supply, price elasticity and income effects on customers. Demand is the availability of a product that a person is able to purchase at the indicated price. Demand is an important tool in the market. The law of demand states that as the price of a product increases, the demand for that particular product will decrease. Price and quantity demanded have an inverse relationship with each other. Price elasticity of demand is another concept that shows a change in the responsiveness of a good or service due to a change in its price. The price elasticity of demand can be calculated with this formula:-% change in quantity demanded% change in priceSupply is another tool used in the market. The offer is the willingness of a supplier to supply its product at the determined price. The law of supply states that if the price increases, the supply also increases. In this case price and quantity supplied have a direct relationship. Price elasticity of supply is the responsiveness or elasticity of the quantity supplied of a good or service to a change in its price. Supply and demand play an important role in the economy. It helps determine the price of a product with the forces of supply and demand. An equilibrium point is reached, where the quantity demanded equals the quantity supplied, represented by the intersection of the demand curve and the supply curve, as shown below:-A supermarket in Malaysia, commonly known as "Giant", is a very large supplier. It has a wide range of products including food, clothing, electronics and so on. Their target audience is mainly middle class people, but they make sure to provide such products... middle of paper... we have discussed the above mentioned points, we can conclude that, supermarkets like Giant have a higher risk of keep large stocks, as it could turn into a threat for them, if there is a change in taste and fashion for their customers. They should use “just-in-time method” as it can help and prevent threats. As for grocery stores like Cyberia Market, we can conclude that they operate in a niche market. They can strengthen their relationship with customers by being direct with them. The owner should try to have a casual relationship with his daily customers so that they do not lose their customers. This also can help the owner or manager of Cyberia Market to understand their customers, predict whether there will be a change in the taste or fashion of their customers, and satisfy these needs or desires in time in order to maximize their profits..