The main purpose of the fourth paragraph is to

Lucy on September 20 at 09:12PM

Why not D?

Thank you!

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Emil on September 22 at 04:16PM

Hi, this paragraph is only talking about modeling one of the ways of thinking, the pin factory. It's not really describing a tension between the two models, which was described earlier, and I think the tension isn't between how they are modeled, but between their implications. There was no tension in modeling the invisible hand.