I recently wrote about provocative tax ideas (choose from the UK version or the US version), including taxing the middle-aged.
Now Greg Mankiw and Matthew Weinzierl suggest taxing tall people, while Alberto Alesina and Andrea Ichino believe women should pay less tax than men. The interesting thing is that Alesina and Ichino seem to be deadly serious while Mankiw and Weinzierl clearly think they’re showing that such taxes are daft.