In 2008, the Massachusetts Registry of Motor Vehicles thought of a way to reduce costs. All the letters they were sending to remind people about their soon-to-expire car registrations were costly. So they got rid of these reminders. In a way this made perfect sense, but in light of our analysis, you can see why it might be foolish. Registrations expire at a fairly random time, solely a function of the last time you registered. Without a reminder, it is hard to remember the date. For the poorest and the most hurried, these reminders were likely the only thing that kept the registration from
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