ドーナツ化現象
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Meanings
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doughnut effect; donut effect
Urban-planning term describing the hollowing out of city centers as residents move to the suburbs, leaving a low-population core surrounded by a populated ring.
In regional cities, the doughnut effect is serious, and the hollowing out of central urban areas is progressing.
As a countermeasure to the doughnut effect, the compact city concept is attracting attention.