I wonder if it would lead to lower prices. Here in Sweden where basically anybody can start a taxi company the end result is that most companies a grouped within a couple of bucks of the two big taxi firms on the low end of scale plus a few companies charging two or even three times as much, and operating on the assumption that enough people (especially tourists who don't understand the taxi system) will simply jump into the first taxi they see without looking at the price. I've yet to see anyone trying to break into the market by significantly undercutting the big players.