The branch of economics that looks at the operation of a nation's economy as a whole is:

The branch of economics that looks at the operation of a nation's economy as a whole is Macroeconomics.

Explanation:

The branch of economics that has a whole look of nation,s economy is called as macroeconomics. It examines the behavior of the market system that operates nation wide. It examines and study about the things like inflation, economic growth rate, GDP, unemployment changes and national income, price levels.  

Microeconomics deals with the decision structure of an individual who make up the larger economic system. In contrast to microeconomics, macroeconomics looks at the behavior and the performance of the economy wholly and not as smaller parts.

the correct answer is economics is a game without winners or losers.

unlike sports or games economic is a game without losers or winner rather it is a game where everyone wins. parties of business doing businesses exchange money with each other and hence exchange is done on the basis of goods. one party takes the goods and other sales it so there is winner on both sides. each party values more highly the good it gets than the good it gives up. both sides exchange only because both intend to increase their value. so there is no concept of lose or win.