The Effect of Unions on Productivity

In general, I can't say that I am a fan of unions. I believe they served a purpose that is now largely unnecessary, at least in the developed world. Economic choice has reinforced this with union membership dropping steadily. The Economist though has a thoughtful article that references Stephen Bainbridge on the subject who argues that rather than being negative, the net result on productivity of unions may be closer to zero. Hat Tip: Instapundit.