Demand is the basis for starting a business, as the product decision and amount produced depends on prevailing market demand. Demand indirectly determines the factors of production required. Demand is defined as the various quantities of a commodity that consumers will purchase in a given market period at different prices. For there to be demand, there must be a desire for the commodity, sufficient resources to purchase it, a willingness to spend on it, and its availability at a certain price, place, and time. The determinants of demand include price of the product, consumer income, tastes and preferences, prices of substitutes and complements, consumer expectations, population, climate, and advertising. Demand is expressed as a function of these factors