How did the economy produce all these amazing things that we have around us - computers and cell phones and so on? There were a bunch of ideas, and the good ones grew and prospered. And the bad ones were pretty ruthlessly weeded out.
经济是如何产生我们身边所有这些神奇的东西的——电脑和手机等等?有很多想法，好的想法不断发展壮大。坏的被无情地淘汰了。
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