Single Screen Productivity

Here’s a claim for which I have absolutely no data: I believe I am more productive with a smaller screen/monitor. I have a 13” MacBook Air that I occasionally hook up to a 21-inch external monitor. Sometimes, when I want to read a document I’ll hook up the external monitor so that I can see a whole page at a time. Other times, when I’m using R, I’ll have the graphics window on the external and then the R console and Emacs on the main screen.