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Articles On International Issues Related To Macroeconomics . Demographic changes in the last two centuries, along with fundamental changes in lifestyle, technology development and various rising of expectations in promoting physical, mental and social welfare have led to the further consideration of population issues and developing. More formally, it states that the decision rules of keynesian models—such as. Choosing ways to enhance productivity Obserwator from www.obserwatorfinansowy.pl Paul krugman, a new york times opinion columnist, writes about macroeconomics, trade, health care, social policy and politics. In 2008, he received the nobel prize in economics. The lucas critique, named for american economist robert lucas's work on macroeconomic policymaking, argues that it is naive to try to predict the effects of a change in economic policy entirely on the basis of relationships observed in historical data, especially highly aggregated historical data.