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cost of mailing spam messages, on the total number of messages that spammers send. We show that increasing the cost of … mailing spam messages have the unequivocal effect of reducing the total number of spam messages sent by spammers. On the other … hand, improving the quality of the filters have an ambiguous effect: users who uses the improved filter receive less spam …
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If communication involves some transactions cost to both sender and recipient, what policy ensures that correct messages - those with positive social surplus - get sent? Filters block messages that harm recipients but benefit senders by more than transactions costs. Taxes can block positive...
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