In the beginning, there was sharing. That, at least, is the story according to Dominik Wind, a German environmental activist with a genial smile and a cycling cap whom I met in Paris while attending a conference earlier this month about the sharing economy. Years ago, out of curiosity, Wind visited Samoa for half a year; he found that people shared tools, provisions and even sexual partners with their neighbors. Less encumbered by industrial civilization, they appeared to share with an ease and forthrightness long forgotten in the world Wind knew back home.