Answer: A. positive but incorrect.
Explanation: The statement is positive but incorrect because macroeconomics does deal with industries, and firms but it is more concerned with the general economics or large scale factors like interest rates, national productivity, national income, Gross domestic product (GDP). This in general is what micro economics entails
Answer: Option A
Explanation: The basic organisational structure and several different characteristics prevailing in a business environment together constitutes a market structure. In an oligopolistic there are very few large firms which dominate the market, for example - auto industry.
As firms in the oligopolistic market are very high this results in high concentration in the market. Each firm in this market structure operates in so large scale that actions of one affects the operations of others.
Usually the capital need in such industries is too large making it difficult to entry also the need for several licenses acts as barriers to entry but there is no such thing like NO ENTRY in such industries.
