Dotnaught writes "Can the free market stop spam where technology has failed? As described in InformationWeek, Professor Marshall Van Alstyne of Boston University School of Management has co-authored a soon-to-be-published paper that proposes an "attention bond" -- money put up by email senders that recipients collect only if they consider the message a waste of time. Supposedly, this market-based filter performs better than a perfect technology-based solution, with no false positives or negatives. A company called Vanquish already has a working model. Is selling one's attention the answer to spam?"