What is winner-takes-all market? How's the distribution of reward among them?

A winner-takes-all market
one where the top players capture a disproportionately large share of the rewards, while the rest of the performers are left with extremely little.
Individuals are paid not according to their absolute performance, but rather according to their performance relative to their competitors.
Simply when the top supplier or performer earns disproportionately more than his, her or its competitors, it is a winner-takes-all market.