| Abstract: | Game theory is a branch of mathematics which analyses interdependent decision-making. It attempts to explain how decision-makers might take into account the likely response of others in formulating their own decisions. It has long been applied to microeconomics especially to the theory of the firm under oligopoly where the firm, in devising its pricing and production strategy, will take into account the likely reactions of other firms within the industry. More recently it has been appreciated that many situations in macroeconomics can be analysed in terms of game theory. For example, if one country introduces import controls, how will others react? If one country tries to control inflation by adopting a tough monetary policy, or tries to reflate, what will other countries do? How will exchange rate speculators respond to the government's announcement that it will not intervene in currency markets? Will they believe the government or will they adopt actions which will eventually force the government to intervene? How will markets respond if the government changes its macro-economic strategy? In some cases the “players” are the government and the business community, in other cases one government may be playing against another. In this Briefing Paper we introduce some ideas and results from game theory and show how they can be applied to macroeonomics as well as microeconomics. |
