Factors which affects the supply of commodity are :
(i) Change in technology : The supply of a commodity depends on the production technology used by the firm. If there is an improvement in the production technology used by the firm, the cost of production declines. Lower cost of production increases the supply of a commodity. The use of obsolete technology raises the cost of production and consequently supply of a commodity decreases.
(ii) Change in goals of the firm : The supply of a commodity also depends upon the goals of firms. Their goals may be profit maximization or sales maximisation. If their goal is to maximise profits, more quantity will be supplied only at high price. But if the firms want to maximise their sales, more quantity will be supplied even at the same price. Thus, change in the goals of the producers also influences the supply.