investigation revealed that the culprit was goals. New York taxi drivers rent their vehicles in twelve-hour shifts, and commonly set themselves the daily goal of taking in double the amount of money that it costs to rent the cab. When it rains, they meet their goal more rapidly, and head home sooner. New Yorkers are thus deprived of taxis during exactly the weather conditions in which they need them most, while drivers are deprived of additional income at exactly the time when it would be easiest to earn.
