生物与医学2019ncbi.nlm.nih.gov
生命是一场庞氏骗局
Life Is a Ponzi Scheme (2009)
入门 · 约 15 分钟读完前置知识：人口老龄化基础、代际转移概念、基础经济学
导读
这篇 2009 年发表于 Genome Biology 的文章以庞氏骗局为比喻，讨论发达国家的人口老龄化与代际供养结构：少数老年人依靠人数更多的年轻劳动者提供经济支持。作者认为，过去长期呈金字塔形的人口年龄分布，因出生率下降和寿命延长而逐渐柱状化甚至倒置，使这种代际转移安排面临不可持续风险；文章更像观点/评论而非实证研究。
HN 关注点：用庞氏骗局这一尖锐比喻串起人口老龄化、代际福利、生态资源上限与经济增长极限，并引发对年轻世代未来的担忧。
HN 评论精选
这几条评论里：支持 1 质疑 1 补充 1
支持概括文章核心比喻：代际供养结构随人口年龄分布从金字塔变为倒置而不可持续。
这篇 Genome Biology 文章很好读：先用浅显语言解释庞氏骗局和麦道夫如何敛财，再提出核心观点——生命本身基本上就是一个巨大的庞氏骗局，而且这个金字塔已危险地接近崩塌。发达国家里少数老年人的许多需求，靠人数更多的年轻人的经济贡献来照护；这曾合理，因为一万多年来人口年龄分布一直是金字塔形，从大量幼儿到极少数老年人。但 1950 年代后出生率下降、预期寿命上升，金字塔开始更像柱状，未来 40 年将变成柱状并慢慢倒置。值得全文一读。
baxtr查看英文原文
A very good read in the Journal Genome Biology explaining in simple words how Ponzi and Madoff made millions, and then, describing his idea: Now, the reason you're reading about this here, is that I just realized that life itself is basically a gigantic Ponzi scheme, and the pyramid is dangerously close to collapsing. In the developed world, we have evolved a society in which a relatively small number of old people have many of their needs cared for through the financial contributions of a larger number of much younger people. And that made sense, because for over 12,000 years the age distribution of the human population was, in fact, in the shape of a pyramid, with a huge base of young children rising to a smaller number of teenagers and a still smaller number of young adults, and so on up to a tiny tip of the elderly. But sometime in the 1950s, as the birthrate declined and life expectancy continued to increase, the pyramid started to be shaped more like a column. Within the next 40 years it will become one, and then it will slowly invert. I can recommend a full read, it’s worth the time.
补充从生态繁殖与资源约束看，人口萎缩将挑战以规模为基础的经济，并成为发达国家长期政治议题。
既然这是生物学期刊，我本以为会有更宏大的视角。看生态系统，几乎所有生物繁殖都远超可持续数量。有人算过，如果第一个细胞一直按当时速度分裂，现在会出现太阳系大小的球之类。之所以没发生，是因为资源危机；任何物种按自然速率持续翻倍都会耗尽食物或成为他者食物。回到社会，我们似乎没准备好人口萎缩。对一个一直朝一个方向变化的变量做预测很难，但它正显现转向迹象。经济有多少其实只是规模？逆转时会发生什么？这会成为许多发达国家长期的主要政治主题：年轻人更少，但投票人数也少于受益的老年人；移民可能是解药，但能持续多久、代价如何？我觉得这已是某种底层动态，只是不常上头条。
lordnacho查看英文原文
This being a biology journal, I was kinda expecting an even larger perspective. If you look at how biological ecosystems work, just about every creature reproduces way more than what is sustainable. Someone did a calculation that if the first cell had kept splitting at the rate it had, there'd be a ball the size of the solar system by now or something crazy like that. The reason it doesn't happen of course is that you run into resource crises. Any species that keeps doubling at their natural rate will run out of food, or it becomes food for others. Coming back to society, it's as if we just aren't prepared for a shrinking population. It's hard to make preditions against a variable that's always gone one way, but is showing sign of turning. How much of the economy is really just size? What's gonna happen when that reverses? This will probably be a major political theme that lingers in many advanced nations. Fewer young people to work, but also fewer votes than the people who benefit. Immigration as a potential cure, but for how long, and at what cost? I tend to think it's already a kind of underlying dynamic, just not the one that appears in the headlines so often.
质疑反驳人口决定论：生产率提升和消费选择可缓冲冲击，而临终医疗支出使预防性医疗难以解决老龄化成本。
生产率增长可以快于人口结构变化。凯恩斯曾预测我们能过渡到每周工作 15 小时并维持 1930 年代生活水平。他说对了，但我们集体选择工作差不多时长、消费更多。未来五十年生活水平也许不会提高那么多，但不会仅因人口变化而崩溃。更关注预防性医疗也不能解决问题。正如作者指出，50% 医疗支出花在生命不足 30 天的人身上。你“预防肝衰竭”之类，人们多活一年然后死于心衰。没有现实医学研究方向能预防所有需要照护的疾病、让每个人 100% 健康直到某天死去。
dmurray查看英文原文
Productivity gains can increase faster than demographics change. Keynes predicted that we could move to a fifteen-hour working week and keep living at 1930s standards. He was right, but collectively we decided to work about the same and consume more instead. In the next fifty years, perhaps our standard of living won't increase as much, but it won't crash purely because of demographic changes. And focusing more on preventative healthcare doesn't address the problem, either. As the author points out, 50% of healthcare spending is spent on people with less than 30 days to live. If you "prevent liver failure" or whatever, people live a year longer and die of heart failure instead. There isn't a realistic direction for medical research that prevents all diseases requiring care, and leaves everyone 100% healthy until one day they are dead.
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