3 A Multitude of Models So we will learn different models for studying different issues (e.g.unemployment,inflation,long-run growth). ■For each new model,you should keep track of掌握.的线索，记 录) its assumptions, which of its variables are endogenous and which are exogenous, the questions it can help us understand, and those it cannot. Return CHAPTER 1 The Science of Macroeconomics slide 25 CHAPTER 1 The Science of Macroeconomics slide 25 A Multitude of Models ▪ So we will learn different models for studying different issues (e.g. unemployment, inflation, long-run growth). ▪ For each new model, you should keep track of(掌握.的线索，记 录) – its assumptions, – which of its variables are endogenous and which are exogenous, – the questions it can help us understand, – and those it cannot. 3 Return