Yuta Yamasaki and his wife moved from southern Japan to Tokyo a decade ago because job prospects were better in the big city. They now have three sons — ages 10, 8 and 6 — and they are looking for a larger place to live. In the past half century, by investing in transit and allowing development, the city has added more housing units than the total number of units in New York City. It has remained affordable by becoming the world’s largest city. It has become the world’s largest city by remaining affordable.

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Persons: Yuta Yamasaki, Yamasaki Locations: Japan, Tokyo, United States, New York City