In the byzantine empire, who had the final say on church matters?
the emperor
the king
the patriarch
the pope

The correct answer based on the given question above if who has the final say on church matters in the Byzantine Empire, would be the first option. It is the emperor, in the Byzantine Empire, that had the final say on church matters. 

a side effect of a good or service generating benefits or costs to someone who doesn’t decide how much to produce or consume

Explanation:

Externality is a microeconomic concept that aims to explain the positive or negative impact that an economic activity has on third parties. If by exercising an economic activity, a company indirectly benefits society or community, the externality is positive. If economic activity negatively impacts the surrounding community, externality is said to be negative. For example, the pollution that an industry emits in the production process has deleterious effects throughout society, being a negative externality. Likewise, a truck causes potholes in the road, this is a negative externality, since all citizens' taxes, including most non-truckers, will be used to restore potholes in the roadway.