[Solved] According to Professor Jenkins,the problem with fighting child pornography is that ________. A) we already know all there is to know about child pornography B) it is such a small problem, there is no need to be concerned C) the legal crackdown prevents serious research to study and uncover how it functions D) it is not a legitimate topic for research Cross-Price Elasticity: A measure of how the quantity demanded of one good responds to a change in the price of another good. Substitutes: Goods or services that can be used in place of each other, where an increase in the price of one leads to an increase in demand for the other. Price Inelastic Demand: A situation where the quantity demanded of a good does not change significantly in response to changes in its price. Luxury: Goods or services that are considered superior in quality and high in price, often seen as status symbols and not essential for basic needs.