What does an agrarian economy mean?

"agrarian" means farming so an "agrarian economy" is an economy based on income from agricultural produce and the land.

the actual agrarian means Agrarianism has two common meanings. The first meaning refers to a social philosophy or political philosophy which values rural society as superior to urban society, the independent farmer as superior to the paid worker, and sees farming as a way of life that can shape the ideal social values.[1]It stresses the superiority of a simpler rural life as opposed to the complexity of city life, with its banks and factories.

refer: wikipedia