My favorite type of model

Scientists build models that capture the essence of some observed phenomenon. The models that I like best are strongly simplified. This in contrast to very complex and non-transparent models that try to replicate every aspect of reality. Good models allow us to gain insight into something we observe by using a limited number of key concepts. I use simple models to be explicit about the underlying assumptions and to be consistent. Continue reading “My favorite type of model”

Quiz: Can you spot the economic errors of Scott Sumner?

I was doing some research for a post about how the Trump presidential candidacy exposes the political biases of economists. But then I came across the blog of Scott Sumner. Professor Sumner has been teaching economics for over 25 years. Mr. Sumner is an advocate for a monetary policy called NGDP targeting. He also hates Donald Trump.

What I found stunning while reading Dr. Sumner’s articles are not his political views, but rather how poor his understanding of financial economics really is. As an exercise, I recommend that you take a look at these three articles. Can you identify his implicit assumptions and outright false claims? Continue reading “Quiz: Can you spot the economic errors of Scott Sumner?”

Helicopter bonds – A reply to Nick Rowe

It is not my ambition to police the blogosphere, but since helicopter money is such a hot topic, this post will point out some inconsistencies in yesterday’s post of Nick Rowe. Keep in mind that I do not criticize him as a person! I have a lot of respect for people who are open about their thinking process, free for the whole world1 to see. Especially when they have a professional stake in this (Dr. Rowe is a professor of economics).

I have copied Nick’s post below in its entirety and put it in italics. The pictures and normal text are mine. For ease of discussion in the comments or on Twitter, I have labeled the pictures as Cases. Continue reading “Helicopter bonds – A reply to Nick Rowe”