Actually, sales of music on physical media are in a steep decline (like 30% less than just 2-3 years ago). The only area where this is not true is classical music, since the quality of downloads is not good enough. And the same will be happening with movies. Downloads will replace DVD and Blu-Ray rentals and sales. So some industries will close and new opportunities open up. Online stores also need employees. The only question is, who will make the cut and the transition to the new era. A lot of physical bookstores won't.
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