production. Fixed inputs can affect the price of inputs, and the scale of production can affect how much the fixed costs translate into the end price of the good. Number of suppliers: The market supply curve is the horizontal summation of the individual supply curves. As more firms enter the industry, the market supply curve will shift out, driving down prices. Government policies and regulations: Government intervention can have a significant effect on supply. Government intervention can take many forms including environmental and health regulations, hour and wage laws, taxes, electrical and natural gas rates and zoning and land use regulations. This list is not exhaustive. All facts and circumstances that are relevant to a seller's willingness or ability to produce and sell goods can affect supply. For example, if the forecast is for snow retail sellers will respond by increasing their stocks of snow sleds or skis or winter clothing or bread and milk. Cases that violate the Law Of Supply/ Exceptional cases to the Law Of Supply. Agricultural products / Perishable goods: Due to their nature of having a short shelf life, immediately after harvest they are offered in the market for sale in large quantities during which prices are usually low. During dry season / planting season, it is the opposite. Commodities produced in fixed amounts: For example some commodities which depend on the machine set up, in this case at different prices in the market the commodity may be offered in the same quantity. Supply of Labour in the market: The senior management/executive positions have high wages but work a few hours as compared to staff members who earn middle wage levels but work for the longest hours. Supply function and equation Supply functions, then, may be classified according to the source from which they come: consumers or firms. Each type of supply function is now considered in turn. In so doing, the following notational conventions are employed: There are I produced goods, each defining a single industry, and J factors. The indices i = 1,…, I and J = 1,…, J run, respectively, over produced goods (industries) and factors. Let n index all goods by first listing produced goods and then factors so that n = 1,…, I, I + 1,…, I + J. The number of firms in industry i is written L i, and these firms are indexed by l = 1,…, L