El coste de oportunidad para #freelancers. Interesante. Decir "sí" a veces también cuesta dinero. http://t.co/dg583X8O #sethgodin
June 26, 2012
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How much does it cost to go to a movie? Okay, now what's your answer if I told you that while the movie is taking place, you have to miss the final debate in the school board election, in a...