The selling concept takes an inside-out perspective.

推销观念采用一种由内而外的视角。

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The selling concept starts with the factory, focuses on the company's existing product.

推销观念从生产企业出发，以企业现有产品为中心。

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The selling concept holds that consumers and businesses, if left alone, will ordinarily not buy enough of the organization's products.

推销观念认为，如果让消费者和企业自行选择，他们不会足量购买某一企业的产品。

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He was selling that day in SoHo: selling the All-Star Game, selling the MLS, selling the concept of the "Beckham Effect" on the U.S. Soccer.

WSJ: David Beckham: A Farewell to the Faux Hawk

So to address your first question: Yes, Paul has sold out, but I'm not sure the concept of selling out has all that much traction anymore.

NPR: Slate's Ad Report Card: Sir McCartney's Fidelity Ads

Hollywood is still clinging on to the concept of selling physical goods like BluRay and DVD disks and giving those formats an advantage over legal streams.

FORBES: Internet VOD: Some progress but still ways to go