造成这种投资不足的因素有很多，但可能最主要的一点是在向许多发展中国家投资的过程中有不少中期的制度性障碍。 在这些国家里现在似乎长期投资的回报最高。
This investment shortfall is due to many factors, but perhaps the main one is that there are substantial medium-term institutional roadblocks to investment in many developing countries, where long-term returns now seem to be by far the highest.