Well, the answer is we don’t. Yes, for common people, there is really no need to spend much time on thinking about some unrealistic philosophical questions. Are you the same person as who you were yesterday? Is the world your own world or is it shared by all other people? Well, getting the answer to …

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Let me start by telling a story. Imagine in an imaginary world, there was an Army General whose name was Alice. In her office, she had a radio on her desk. She loved it. Everyday she spent a lot of time listening to it. Somehow, what she didn’t know was, that every night after she …

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Well, if you don’t know, yesterday the Nobel Prize for Economics this year was awarded to Professor David Card from University of California, Berkeley, for his empirical contributions to labor economics. The prize was shared by Guido Angrist and Joshua Imbens, for their contributions to the analysis of causal relationships. Professor Card wrote a recommendation …

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