General purpose of this lecture is to presentation on the Market Forces of Supply and Demand. Here briefly analysis which factors affect buyers’ demand for goods and which factors affect sellers’ supply of goods. This lecture also discuss on how do supply and demand determine the price of a good and the quantity sold. Finally analysis how do changes in the factors that affect demand or supply affect the market price and quantity of a good and how do markets allocate resources. Here also explain three Steps to analyzing changes in Eq’m and How Prices Allocate Resources.