'Most books begin by defining their subject. But definitions are tricky and often are not the best way to introduce a subject. Imagine trying to interest people in tennis by defining what tennis is and how it is played. Far better to let them watch a match or try to play themselves. This approach also applies to macroeconomics. Understanding how the economy works helps us interpret the past; it makes our world more comprehensible; and it helps us to think intelligently about the future. Such skills help us make better decisions. However, we think offering a sophisticated definition of macroeconomics is a poor way to convince you of these things. To demonstrate its relevance, we prefer to illustrate the types of issues macroeconomics deals with.'
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