最具影响力的美国发明
《华尔街日报》盘点了美国历史上最具影响力的发明，从电灯、电话到互联网和智能手机，这些创新深刻改变了美国乃至全球的生活方式、经济结构和文化形态。文章回顾了这些发明的诞生背景、关键人物及其对社会产生的深远影响。
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The article examines construction cost trends and finds that, unlike most other sectors, construction costs rarely fall over time. This is linked to stagnant or declining productivity in construction, especially in large, wealthy countries like the U.S., where productivity improvements seen in manufacturing and agriculture are absent.
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