It's not easy to sell macroeconomists on a new idea, as I've discovered over the past decade. Here I'd like to discuss some mistakes that people make, and then offer a few suggestions.  (Note that I have often made these sorts of mistakes, so I speak from experience.) One mistake is to tell people that their approach is wrong, because they don't understand certain accounting relationships. Here are a few examples of claims that I see people make: 1.  There...