Capitalism is a social system which now exists in all countries, the means of producing and distributing goods are owned by a small minority of people. Adam Smith earlier called " the obvious and simple system of natural liberty."
In capitalism, everything you buy, you have to earn first. So it kinda goes around like a cycle.
while others encourage a capitalist society is selfish as people work for their own money. However, a closer look suggests that it can result in benefits for the society as every job can help someone else.