my name is mark gruberg. i am a taxi driver with green cab, a problem k medallion holder and a member of the board of the san francisco taxi alliance. everybody wants the purchases of medallions to see relief from the terrible burden of debt that they face, but what has been proposed is going to create more problems than it solves. restricting the airport to purchased medallions will shut out thousands of drivers. the competition in the city is already extremely fierce. it will be unbearable with hundreds of cabs forced to work only in the city. no one will want to drive any one of those cabs. drivers who have already been pushed to the brink by uber and lyft will drop out of the industry. new drivers will be impossible to recruit because they, above all, depend on the airport for their livelihood. cab companies won't be able to lower gates because they are barely making it as it is. this is be ruinous for the drivers and companies they work for. the city created all of this, and the city needs to solve this.