Micropay per email

According to Rady, the e-world would be a better place if we had to pay for each email sent. The rationale is that people would actually think twice before sending email (instead of the current logorrhea): no more bad jokes, useless links, and probably much less spam! Take SMS for example: the percentage of short text messages I receive that deliver a useful piece of information is much higher than the percentage of equivalent emails. That's a good clue.