Studies the behavior of the whole (aggregate) economies or economic systems. Macroeconomics attempts to forecast national income and predict the extent to which the government should intervene in the economy and what that intervention will be.
The degree of material comfort available to a person or a country's residents. Gross Domestic Product (total of a country's output) divided by the country's population is the best indicator for a country's standard of living.
This chart attempts to summarize the importance of Macro-economics