While I wholeheartedly agree with the reasoning presented in the talk, I can see why TED chose not to distribute it. It presents a pretty conventional argument for progressive taxation, without bringing any new facts or insight to the table. Historically, there is no evidence of a significant correlation between top tax rates and economic growth. Whether you believe taxes help or hurt the economy is strictly a matter of faith---conservatives hold one opinion unsupported by the facts, liberals another. Unfortunately this talk doesn't shed any additional light on the matter.