By discounting book prices and absorbing shipping costs, Amazon.com is in effect reducing the price of the books its customers are charged. If Amazon.com hopes to make money through such a discounting policy, it must reduce its costs of operations to offset shipping charges. But perhaps more important, Amazon.com can realize larger income owing to a phenomenon explained by the economic concept of price elasticity of demand. Explain how the right price elasticity conditions can justify Amazon.com’s discounting policy.