An empire is a dominating nation with extensive territories and a powerful ruler, such as Rome. Hope this helped!
They were selected to spread Jesus' teachings.
The market economy is an economy type in which the private sector controls all the businesses in the particular economy. The government doesn't have any influence on the production of goods and services. The production of goods is actually determined by the consumers, as they are the ones that buy the products, and they choose the products that have the highest quality with the lowest price, or rather a balance between the two.