Buying and Selling is:
O Economy
O Socialism
O Trade
O Capitalism

I'd say Capitalism

Explanation:

It is part of economy as a whole, but it is also capitalism.

Definition of economy: the wealth and resources of a country or region, especially in terms of the production and consumption of goods and services.

Definition of capitalism: an economic and political system in which a country's trade and industry are controlled by private owners for profit, rather than by the state.

byzantine empire is the answer i think you are looking for.

hope this : )

some people are just against it im not sure but i think everyone deserves to be treated equally i think people have a problem with it because its different and not like everything else i hope this !

< < < emily> > >