Are we nearing a dramatic moment in economic history? Before humans developed agriculture, the world population — and thus the world economy — doubled in size roughly every 250,000 years. After acquiring the power of agriculture, the world economy doubled in size roughly every 900 years. After the industrial revolution, growth accelerated again, and since the second world war the world economy has been doubling in size roughly every 15 years. These numbers have been collated by Robin Hanson, an economist at George Mason University in Virginia; they are based on educated guesses by various economic historians.
我们正接近manbetx20客户端下载 史上的戏剧性一幕么？在人类发展农业以前，manbetx app苹果 人口（以及世界manbetx20客户端下载 规模）大约每25万年增长一倍。而在人类获得农业生产的力量之后，manbetx app苹果 manbetx20客户端下载 规模大约每900年增长一倍。工业革命之后，manbetx app苹果 manbetx20客户端下载 增长再次加速。而自二战以来manbetx app苹果 manbetx20客户端下载 大约每15年增长一倍。上述数据是由弗吉尼亚州乔治梅森大学(George Mason University)的manbetx20客户端下载 学家罗宾•汉森(Robin Hanson)整理的，基于多位manbetx20客户端下载 史学家给出的有历史依据的估计。