Do you do Twitter? It is a playful but also a powerful medium. You can  amuse, annoy, proclaim, inform, report, and certainly upset. Sometimes a  few informal words can lead to a much more thoughtful response. On one  dark winter’s night recently, I sent a stream of tweets about the impact  of economic thinking on health. I have witnessed the power of economics  to strengthen the case for investments in global health. I have seen  economists take an increasingly important and valuable leadership role  in shaping the debate about development assistance for health. And in  thinking about sustainability for the post-2015 era, I have been  grateful to economists for emphasising that traditional ways of thinking  about economic growth simply do not apply when sustainability is our  chief concern. But there is a but.
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