This in a nutshell is the clustering force.
简而言之，就是聚合力。
What's less obvious is the incredible power of what I call the clustering force.
一种难以置信的力量，我称之为聚合力，却没那么显而易见。
The clustering force makes each of us more productive, which in turns makes the places we inhabit much more productive, generating great increases in output and wealth.
聚类力使每个人更加有成效，反之，又会是我们的居住地更加有成效，在出口和财富方面产生较大的增长。
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