Does the Stock Market Have Bubbles? Two Nobel Laureates Disagreed for a Lifetime 股市有没有泡沫？两位诺奖得主吵了一辈子
This is Suzhou Victory Textile Co., Ltd.
Does the stock market have bubbles? Economists have debated this for decades. Even the Nobel committee couldn’t decide—in 2013, they gave the prize to two economists with completely opposing views.
1. Alchian’s “Prediction”
A story. After leaving the military, economist Armen Alchian worked as a consultant at RAND Corporation. At the time, the military was developing the hydrogen bomb, and everyone was curious about the raw material—lithium, beryllium, thorium. Alchian didn’t spy. He did something simple: he checked stock prices.
He found that over the previous six months, the stocks of companies producing those materials had barely moved—except one. That stock had jumped from two or three dollars to thirteen. Alchian wrote a brief piece titled “The Stock Market Speaks,” concluding that this company’s material was the one. A few days later, the paper was recalled. He was right.
The lesson: so‑called secrets are often no longer secrets. Someone already knew, and the news was already reflected in the stock price.
2. Efficient Market Hypothesis: Prices Already Know
Economist Eugene Fama systematized this into the Efficient Market Hypothesis. Core idea: asset prices already reflect all available information.
Three versions:
· Weak: Historical prices are useless—studying charts is a waste.
· Semi‑strong: All public information—earnings reports, news, research—is already priced in.
· Strong: Even insider information has already leaked and been absorbed.
If Fama is right, how should you invest? Pin a list of stocks to the wall and throw darts blindfolded. The money you save on research is your profit. That’s the core of A Random Walk Down Wall Street: even a monkey throwing darts can match the experts.
3. Irrational Exuberance: Bubbles Are Real
The other side disagrees. Robert Shiller wrote Irrational Exuberance, arguing that humans are far from rational—panic overshoots, greed overshoots. He warned about the dot‑com bubble and the housing crisis before they happened.
His classic metaphor: a beauty contest. You don’t vote for the person you think is most beautiful—you vote for the one you think others will pick. The stock market is the same. You know a stock is overpriced, but you buy because you believe someone even more foolish will buy it from you at a higher price. That’s “greater fool” theory.
4. Who’s Right?
I lean toward Fama. Even if Shiller is right—even if human irrationality follows patterns, like people saying “this time is different” before every bubble—once those patterns are discovered, they’re no longer secrets. They become public information, absorbed into prices. In that sense, Fama’s theory is broader.
5. So Why Do Analysts Still Exist?
If prices are unpredictable, why are there so many analysts?
Because their value isn’t predicting tomorrow’s ups and downs. It’s helping you understand industries, analyze companies, assess fundamentals. A weather forecast can’t tell you whether the stock market will rise tomorrow, but it can tell you a typhoon is coming—whether to set sail is your decision.
At Suzhou Victory Textile, after years in this business, we know one thing: you can forecast the weather, but no one knows which way tomorrow’s wind will blow. Instead of guessing the wind, build a better sail.
这里是苏州维特瑞纺织。
股市到底有没有泡沫？这个问题，经济学家吵了几十年，连诺奖评委都分不出胜负——2013年，他们干脆把奖同时颁给了两个观点截然相反的人。
一、阿尔钦的“神预测”
先讲个故事。经济学家阿尔钦从军队退役后，在兰德公司做顾问。当时军方正在研制氢弹，大家好奇原料是什么——锂、铍、钍，众说纷纭。阿尔钦没去打听军事机密，他做了件简单的事：查股票。
他发现，生产这几种元素的工厂，股价在过去半年几乎没动，只有一家例外——从两三美元跳到了十三美元。阿尔钦写了篇文章《股票市场告诉我们》，断定就是这家公司生产的原料。几天后，文章被收回。他说对了。
这个故事说明：所谓的秘密，早就不是秘密了。有人提前知道了消息，而消息已经体现在股价里。
二、有效市场假说：股价已经包含一切
经济学家尤金·法玛把这个观点系统化，提出“有效市场假说”。核心意思：资产价格已经反映了所有可得信息。
分三个版本：
· 弱版本：历史价格没用，你研究K线图是浪费时间。
· 半强版本：所有公开信息——财报、新闻、研报——都已经消化在股价里了。
· 强版本：连内幕消息也早已走漏，体现在股价里了。
如果法玛是对的，那怎么买股票？把股票名单贴墙上，蒙眼扔飞镖就行——省下的研究费，就是赚的。这就是《漫步华尔街》的核心观点：连大猩猩扔飞镖选出来的组合，表现也不比专家差。
三、非理性繁荣：市场就是有泡沫
另一派不同意。罗伯特·希勒写了本《非理性繁荣》，指出人类压根不理性——恐慌时跌过头，贪婪时涨过头。互联网泡沫、次贷危机，他都提前预警过。
他有个经典比喻：选美比赛，你不会投给自己觉得最美的人，而是投给“别人觉得最美”的人。股市也一样——你知道股票不值那个价，但相信有人更傻，愿意用更高价接手。这叫“博傻”。
四、到底谁对？
我站法玛。因为就算希勒说对了——人的非理性有规律，比如每次泡沫前都有人喊“这次不一样”——那一旦规律被发现，它就不再是秘密，而是被消化进股价的“公开信息”。从这个意义上说，法玛的概括力更强。
五、那分析师为什么还在？
既然股价不可预测，为什么还有那么多分析师？
因为他们的价值不是“预测明天涨跌”，而是帮你理解行业、看懂公司、判断基本面。就像天气预报不能告诉你明天股票涨不涨，但能告诉你台风要来了——该不该出海，你自己决定。
我们苏州维特瑞纺织，做了这么多年面料，最懂一个道理：天气可以预报，但明天的风往哪吹，没人说得准。与其猜风向，不如把帆做好。
#有效市场假说 #非理性繁荣 #股市泡沫 #投资真相 #随机漫步 #EfficientMarketHypothesis #IrrationalExuberance #StockMarketBubbles #InvestmentTruth #RandomWalk #Fama #Shiller #BehavioralFinance #MarketEfficiency #InvestingWisdom #杭州西湖 #WestLakeHangzhou #FashionTextile #knitwarp #knitweft #textile #victory #knitfabric #fabric #victorytex #victorytextile #suzhouvictorytextile #suzhouvictorytextilecoltd #维特瑞纺织 #苏州维特瑞纺织 #苏州维特瑞纺织有限公司
Suzhou Victory Textile Co., Ltd. （苏州维特瑞纺织有限公司）is located in Changshu city(belongs to Suzhou District) Jiangsu,China. 80 Kilometers away from Shanghai Port.
Our team has been working in textile over 18 years.Our mainly products are Tie dyed Fabric,Velour/Velvet,Quilt Fabric,Jacquard Fabric,Single Jersey, Pique,Rib Fabric,Bird Eyes/Mesh Fabric, Interlock, French Terry/Fleece, Polar Fleece, Coral Fleece, Flannel Fleece, PV Plush, Sherpa Fleece,Coarse Needle Fabric etc Fabrics.
Compositions include Polyester,Cotton,Spandex/Lycra,Nylon/Polyamide,Rayon/Viscose,Modal/Tencel,Bamboo,Arcylic,Soybean,Wool,Flax/Linen,etc.
Functional Fabric:Sportswear Fabric(Coolmax,Coolpass,Coolplus,X-dry,Cooldry,Feelcool Ice,Topcool,Sorona,Supplex etc.),Waterproof,Fireproof(Aramid,Polyimide),Heat(Thermolite),Antibiosis(Sanitized),Uvioresistant,Radiation-proof,Recycle,BCI,Organic,Pima/Supima etc Fabrics.
We also have invested a home textiles & garments factory where we move our fabrics to sew many kinds of Garments, blankets etc.
Our marketing team and QC department are checking all the day in every process and keep close contact with customers to make sure customer knows every stage of the production. All the fabrics and blankets are inspected by our QC before packaging and shipping. Also we can provide some certifications Such as Oeko-Tex standard 100, SGS, Intertek etc.
We have production capability 5000 tons of various type of fabrics annually.Our products are mainly transported to China, southeast Asia, Middle East, Europe and America etc.
Welcome to our company. We will highly appreciate any inquiry and question from you and respond asap.We believe you will enjoy one-stop service from us if you work together with us.