A raft of new social-impact and environmental financing vehicle are emerging from labs, incubators and startup funds. By finding inventive ways to monetize social inclusion and environmental regeneration, the new models are "internalizing the positive externalities." Too wonky? Just say "impact alpha." Returns on Investment's resident blue-sky optimist, David Bank, lays bets that the best new ideas will scale up to attract real dollars. Our curmudgeon, Imogen Rose-Smith, is skeptical that many of the impact investment pilots will graduate from the kiddie table and join the adults in the real world of finance. As always, our host Brian Walsh keeps it lively.

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