Solution:Price elasticity of demand is a measure of the change in the quantity demanded or purchased of a product in relation to its price change.
Forward shifting takes place if the burden falls entirely on the user, rather than the supplier of the commodity or service in question. For example, an excise tax on luxuries that increases their price to the purchaser.
Backward shifting occurs when the price of the article taxed remains the same but the cost of the tax is borne by those engaged in producing it. For example, through lower wages and salaries, lower prices for raw materials or a lower return on borrowed capital.
Finally, a tax may not be shifted at all. For example, a tax on business profits may reduce the net income of the business owner. Hence, option (c) is true.