If I am not misunderstanding the timeline discussed in the paper, to the extent that the 'bonus treatment' helped someone obtain a driver's license without the proper skills, they would be behind the wheel in cars on Indian roads from the time they obtained their licenses until at least the offer of the free driving lessons after the final survey. Perhaps the language of 'no social costs' is too strong...
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If I am not misunderstanding the timeline discussed in the paper, to the extent that the 'bonus treatment' helped someone obtain a driver's license without the proper skills, they would be behind the wheel in cars on Indian roads from the time they obtained their licenses until at least the offer of the free driving lessons after the final survey. Perhaps the language of 'no social costs' is too strong...