Answer: Free Enterprise System
Explanation:
The Free Enterprise system is also referred to as the Market Economic system and it refers to a situation whereby the economic decisions in a nation are taken by the individuals or the firms.
In such economic system, the role of the government is minimal and is usually not involved in the market.
The Epic of Gilgamesh, the other ones don't even exist.
The standard of living is improved through something called "comparative advantages", which means that, relative to the nations' total output and ability to make other things, each nation produces something that they're better at making than the other. When the nations trade, they are able to use these comparative advantages to create a more efficient, productive economy.
Even if one nation is wealthier or better off than the other, this principle means that both countries can still become better off through trade.