The correct option is
A black markets, grey markets
Marketing ethics is that area of applied ethics which deals with the moral principles behind the operation and regulation of marketing. The issue of marketing ethics is not limited to the kind of products alone. It also deals with how such products are delivered to the customers. The ethical issues confronted in this area include:
— Pricing: price fixing, price discrimination and price skimming.
— Anti-competitive practices, like manipulation of supply, exclusive dealing arrangements and tying arrangements.
— Misleading advertisements.
— Contents of advertisements.
— Decision making.
— Children and marketing.
— Surrogate advertising: For example, many liquor firms carry advertisements of products, like apple juice, soda and water.
— Black markets and grey markets.