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A 1968 Firing Line interview in which Milton Friedman explains the negative income tax, a proposal to replace welfare bureaucracy with direct payments.

The full-length Numberphile interview with mathematician and hedge fund founder Jim Simons. He discusses his path from mathematics and codebreaking to founding Renaissance Technologies, his use of algorithms in markets, and his philanthropy.

Jason Calacanis interviews investor Chris Sacca on This Week in Startups. Sacca discusses what makes a founder, his investments such as Kickstarter, and his personal story of losing money and recovering.

Charlie Rose interviews Sir James Goldsmith in 1994 about the coming GATT free-trade agreement. Goldsmith predicts that global capital mobility will upset the balance between capital and labor.

Kevin Rose interviews Chris Sacca, founder of Lowercase Capital, for his Foundation series. The conversation covers Sacca's path in venture capital and angel investing, including his early financial ups and downs.

A 13-minute clip from This Week in Startups in which Chamath Palihapitiya describes venture capital as a Ponzi-like scheme driven by fees and inflated valuations among VCs.

A TED interview in which Chris Anderson talks with Jim Simons about his life: code-breaking, math, founding Renaissance Technologies, and his philanthropy in math education and origins-of-life research.

A Startup School SV 2014 conversation between Sequoia's Jim Goetz and WhatsApp founder Jan Koum. They discuss how Sequoia pursued WhatsApp, its tiny engineering team, and how it handled growth and support.

A five-minute clip in which Erich Fromm asks whether the purpose of work is just making money. He argues that white-collar workers end up selling their personality, relating to others the way goods relate to each other on a market, and he points to creative pleasure, participation and usefulness to society as what work could offer instead.

A short clip in which Carl Icahn tells the story of his first activist investment and of firing 12 floors of people, arguing activism need not be short term.