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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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We examine the effect of direct mail (commonly referred to as junk mail) advertising on individual financial decisions …
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