We don't worry about reducing work to a living wage in any other field - we allow free entry into carpentry, construction, business & don't require them to buy medallions before starting to work.
It's a general problem of resource allocation - just like cancer. Some group or cell identifies a resource and starts diverting or blocking it for their own benefit, and this increased power/energy is enough to protect the problem from unmotivated defenders.
"It is the world's most demanding training course for taxicab-drivers, and applicants will usually need at least twelve 'appearances' (attempts at the final test), after preparation averaging 34 months, to pass the examination"
"In all some 25,000 streets within a six mile radius of Charing Cross are covered along with the major arterial routes through the rest of London.... The Knowledge includes such details as the order of theatres on Shaftesbury Avenue, or the names and order of the side streets and traffic signals passed on a route."
Overkill in the era of GPS? Probably. But pretty cool.
Actually, New York already offers owner/operator medallions at a reduced rate. They are transferrable and leasable to a certain extent.
Now imagine you're a fresh aspiring immigrant just coming to New York. Who in his sane mind would loan you $200K with no collateral if you could just decide next year it's not for you and they couldn't even sue you - you have nothing. Who would drive the cabs then - bankers? There's not "anyone else" that could get a loan even of couple of thousands with no collateral and no way to recover it. The best you get is credit cards companies - they charge 20%+ APRs for a reason. Imagine having to pay off a $200K loan with 20% APR.
On the other hand, if you make the license cheap, the corruption potential would be overwhelming - if you have somebody distributing very limited supply of licenses costing $100 but allowing income of, say, $100K per year, an incentive for bribery and other trickery would be impossible to resist. Pretty soon the price would get close to the actual cost, only the difference will be pocketed by corrupt officials.
http://www.calgaryherald.com/opinion/op-ed/Nenshi+Hailing+be...