AS WE SAW in the previous chapter, markets can be dramatically improved when their design encourages people to communicate essential information they might otherwise have kept to themselves. But sometimes markets suffer from too much communication. It is a paradox of market design that as communication gets easier and cheaper, it sometimes also gets less informative. We are seeing this ever more clearly as communication becomes more electronic. Email and social media are good examples. As the volume of messages grows, sorting the real ones from the spam, and the ones that deserve thoughtful
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