Because of the physics of diffusion it doesn't go linearly with distance.

由于扩散现象的物理特性,它和距离不是线性相关的

耶鲁公开课 - 生物医学工程探索课程节选

The lesson is, I think, that we have a glamour-city phenomenon-- that excitement about real estate prices-- centered in places like Los Angeles, but it's spreading and becoming more and more of a national phenomenon and that's the bubble.

我想,教训就是,一种"魅力之都"现象,刺激了房地产的繁荣,起始于像洛杉矶这种城市,随后广为扩散,逐渐演变成一种全国性的现象,这就是泡沫

耶鲁公开课 - 金融市场课程节选

These details aren't important, it is described in your book, but the thing that is important to know is that diffusion occurs fast over short distances, but because of the physics of diffusion it occurs slowly over longer distances.

这些具体细节无关轻重,书上都有,重点是你要明白,距离越短扩散越快,由于扩散现象的物理特性,距离越长扩散越慢

耶鲁公开课 - 生物医学工程探索课程节选