Some folks here might be interested in the simple comparison of fares and medallion prices over recent years that I have posted at http://taxpayer.wordpress.com/2007/02/08/increasing-value-of-taxi-medallions/
Comments at that site are welcome.
Subsequently, I extended the analysis a little bit, and the result is posted at http://hgchicago.org/rn06.html
The results seem to say that an increasing share of taxi revenue is going to the owners of medallions, probably less to the drivers. Is that what people in the business (which I am not) have observed?