What's more, the economic history is clear: without things that give people a buzz, the world would still be in the economic dark ages.

此外更重要的是，经济史很清楚地表明，如果没有让人们感到兴奋的东西，世界仍将处于经济黑暗时代。

The mere fact that this fortune was the accumulated profit of only ten years shows perhaps more eloquently than any other circumstance that the United States had entered a new economic age.

这笔财富只是十年积累的利润这一事实， 也许比任何其他情况都更能说明美国已经进入了一个新的经济时代。