为什么世界五百强企业的国家中没有以色列的身影

http://www.economist.com/node/21543151
这个能说明一些原因，希望对你有所帮助。不会英语的话用google翻译一下。

Small country, big dreams

But even in Israel turning tech start-ups into big companies is difficult. For all the comparisons with Silicon Valley, Israel has not begotten a Hewlett-Packard, an Intel or a Google. Its best companies are often bought by American giants while still in their infancy. The biggest home-grown technology company is Teva, a drugmaker which is listed on NASDAQ, an American tech-oriented stockmarket, with a market capitalisation of $43 billion. In information technology the biggest is Check Point, a security specialist founded by veterans of Unit 8200, an elite army-intelligence group. Also on NASDAQ, on which Israel has more companies than any foreign country bar China, it is valued at $11 billion—no minnow, but no whale.