of TED Chris Anderson who helped develop the wealth pledge option, was among the first to take it.

Other pledges

The Further Pledge

Some members decide to sign the "Further Pledge", where the member defines a basic annual income to live on and donates all income above this level to effective measures.

Founder Toby Ord further pledged to donate anything he earned over £20,000 a year, based on his conviction that he could live comfortably and happily

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