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There is only one authority responsible, and that applies to all countries. It is the government.
Macroeconomics is the study of the economy as a whole. Macroeconomic policy can be split into two branches: 1. Fiscal policy, which is the use of government spending to affect the economy. 2. Monetary policy, the process by which governments set the money supply.
Government
The Constotution should be the government's policy but Pres.Obama ( or should I even call him president) is the one of the factors that effects the policy of the government.
To forecast the future trends of the national economy, with or without making changes. This will assist trade and industry as well as help government to form its policy.
David A. Wilton has written: 'Macroeconomics' -- subject(s): Economic conditions, Economic policy, Macroeconomics
if cars which emit emissions will be liable to pay an environment tax, then a fiscal policy is taking place, ie, it falls under macroeconomics. However, you have to exactly define which government regulations you're talking about... because different regulations give a different situation :)
Norman Fred Keiser has written: 'Macroeconomics' -- subject(s): Macroeconomics 'Economics: analysis and policy'
Edward Shapiro has written: 'Understanding money' -- subject(s): Monetary policy, Money 'Macroeconomics' -- subject(s): Macroeconomics
Thomas R. Ireland has written: 'Principles of macroeconomics and money' -- subject(s): Macroeconomics, Money, Monetary policy
Jorge Marshall has written: 'Ecuador' -- subject(s): Economic conditions, Government policy, Petroleum industry and trade 'Macroeconomics of public sector deficits' -- subject(s): Econometric models, Fiscal policy, Public Debts
Government and the public review the policy and decide if it should be continued, altered, or cancelled.