That's quite a question you've got there!
Okay, here we go, in relation to India:
OLIGOPOLY: A situation where there are only a few sellers in a particular economy who control a particular commodity. They can, therefore, influence prices and affect the competition. In India, an example of this would be mobile telephony - There are only a few operators, examples of which are: Airtel, Idea, BSNL, Reliance
PERFECT COMPETITION: This is an economic situation that really doesn't exist, in which a bunch of conditions are met, not the least of which are free entry and exit from a market, tons of sellers selling the exact same product, and tons of buyers for that product who have perfect knowledge of what it does and how it works....
(The entire section contains 382 words.)