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iPhone普及と米出生率低下に因果関係、NBER研究が示唆
NBERのワーキングペーパーが、iPhoneの普及と米国の出生率低下に「大規模かつ因果的な関係」があると報告。AT&T独占時代のデータを分析し、若年層での出生率低下が顕著だった。
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