This implied that the real purpose of cities, and the reason cities keep on growing, is their ability to create massive economies of scale, just as big animals do.
Perhaps a better analogy: large corporations exist because they can lower the cost of transactions to produce certain products. Cities exist because conditions and spatial concentration can also reduce the cost of transactions.
Perhaps a better analogy: large corporations exist because they can lower the cost of transactions to produce certain products. Cities exist because conditions and spatial concentration can also reduce the cost of transactions.