来自《耶鲁大学开放课程：资本主义：成功、危机与改革 第10集 第10集》

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  So you can see this might have been driven by demand,
  由此可见 这可能是因需求驱动的
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  actually, for investment product in a marketing system
  实际上就是投资产品在市场中的需求
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  that had grown for savings bonds earlier during the war.
  该需求在战时债券营销体系中成长起来
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  Nevertheless, you could see this stuff really
  然而 从图上可以看出这需求
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  take off and peak around 19--late '20s.
  大幅增长并在二十年代晚期达到顶峰
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  That was cumulative, this is just new issues.
  刚才那是积累量 现在图中是新发行
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  There you see the drop around the crash time even more dramatically.
  可以看到在大萧条时期的大幅跌落
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  This is a picture of those--plotting those number of
  这一张图则是表现
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  new issues for commercial bond--for commercial properties,
  商业资产新发行的
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  against new buildings.
  与新大楼的对比
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  Here we only took a look at new buildings
  这里我们考虑的大楼都是
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  that were seventy meters high or so,
  高于七十米的