MacroEcon 101 is about how markets work pretty much exclusively and understand how these thing happen and the influences that go with them. MacroEcon 102 is about how government intervention is a good thing due to things such as negative externalities or the Free Rider problem. MacroEcon 103 is dependent on where you are and can consist of saying hey the individuals will inform themselves so we should give all power to a “benevolent” dictator.