Porter gives several (non-silicon) examples, including the wine-growing industry in northern California and the flower-growing business in the Netherlands.
波特给出了一些例子（并非硅谷），包括加利福利亚北部的酿酒业和荷兰的鲜花种植业。
2
The Netherlands would not be the natural first choice for anyone starting a flower-growing business today were it not for the fact that the business is already there.