{"id":18283,"date":"2026-04-13T14:00:00","date_gmt":"2026-04-13T14:00:00","guid":{"rendered":"https:\/\/www.simtrade.fr\/blog_simtrade\/?p=18283"},"modified":"2026-04-13T11:20:21","modified_gmt":"2026-04-13T11:20:21","slug":"markets-can-remain-irrational-longer-than-you-can-remain-solvent-john-meynard-keynes","status":"publish","type":"post","link":"https:\/\/www.simtrade.fr\/blog_simtrade\/markets-can-remain-irrational-longer-than-you-can-remain-solvent-john-meynard-keynes\/","title":{"rendered":"&#8220;Markets can remain irrational longer than you can remain solvent\u201d \u2013 John Meynard Keynes"},"content":{"rendered":"\n<p><a href=\"https:\/\/www.linkedin.com\/in\/hadrienpuche\" target=\"_blank\"><img decoding=\"async\" style=\"padding: 5px\" src=\"https:\/\/www.simtrade.fr\/blog_simtrade\/wp-content\/uploads\/2026\/01\/img_Hadrien_Puche.png\" alt=\"Hadrien Puche\" width=\"133\" align=\"right\" \/><\/a><\/p>\n\n<p>Is it possible to be right too early? In the world of finance, the answer is often yes. We frequently assume that if our analysis is sound, and if the data is on our side, profit is inevitable. However, history is littered with brilliant minds who correctly identified a market bubble, but got crushed by the weight of markets that refused to see their truth.<\/p>\n\n<p>John Maynard Keynes, father of modern macroeconomics, learned this the hard way in the 1920s, as he nearly went bankrupt betting against the German Mark. He discovered that even his expert theories could be steamrolled by the sheer momentum of a crowd who does not care about mathematics or economics. In one sentence, <b>&#8220;Markets can remain irrational longer than you can remain solvent\u201d.<\/b> <\/p>\n\n<p>In this article, <a href=\"https:\/\/www.linkedin.com\/in\/hadrienpuche\" target=\"_blank\">Hadrien Puche<\/a> (ESSEC Business School, <i>Grande \u00c9cole<\/i> Program, Master in Management, 2023-2027) explores the limits of arbitrage, and why timing is just as important as being correct.<\/p>\n\n\n<h2>About Keynes and this quote<\/h2> \n\n<p style=\"text-align:center\"> John Maynard Keynes<br>\n<img decoding=\"async\" src=\"https:\/\/www.simtrade.fr\/blog_simtrade\/wp-content\/uploads\/2026\/03\/img_john_maynard_keynes_1929.jpg\" alt=\"John Maynard Keynes\" width=\"400\" style=\"margin-top:8px;border-radius:8px\"> <br>\n<small>Source : Cambridge<\/small> <\/p>\n\n<p>John Maynard Keynes (1883\u20131946) was a British economist. In his 1936 work, <i> The General Theory of Employment, Interest, and Money <\/i>, he argued that aggregate demand (the total spending in an economy) is its primary engine of growth. He observed that during crises, a &#8220;liquidity trap&#8221; can occur, where individuals and businesses hoard cash, causing a cycle of stagnation that the &#8220;invisible hand&#8221; of the free market fails to fix without external intervention.<\/p>\n\n<p>Another central pillar of his theory is the idea of &#8220;Animal Spirits,&#8221; the human emotions and instincts that drive financial decisions. Keynes argued that because the future is uncertain, investment is guided more by waves of optimism or pessimism than by cold calculation. To counter all of this, Keynes advocated active fiscal policy: governments should use deficit spending to stimulate demand. His focus was on short-run intervention, famously remarking that &#8220;in the long run, we are all dead.&#8221;<\/p>\n\n<p>While the quote <i>&#8220;Markets can remain irrational longer than you can remain solvent&#8221;<\/i> is frequently linked to him, its true origin is a matter of historical debate. Some credit A. Gary Shilling, an American financial analyst who has claimed paternity of the phrase since the early 1970s.<\/p>\n\n\n<h2>Analysis of this quote<\/h2> \n\n<p><b>This quote is above all a warning against the limits of arbitrage.<\/b><\/p>\n\n<p>Being right about, for example, a bubble, such as the Dutch tulip mania (1636) or the dot-com (2000), is irrelevant if you cannot survive the journey to the correction. A market can remain detached from reality for years, during which three specific pressures act against the contrarian investor:<\/p>\n\n<ul>\n<li><b>Capital constraints and margin calls:<\/b> if you short a stock at $100 because it is &#8220;irrationally&#8221; high, and it climbs to $200, your broker will ask for more collateral. If you cannot provide it, your position will be liquidated at a massive loss, even if you are just days ahead of the eventual crash.<\/li> \n <li><b>Opportunity cost:<\/b> tying up capital in a &#8220;correct&#8221; bet that takes five years to materialize can be devastating; losses incurred from inflation and missed gains in other sectors may outweigh the final profit of the trade.<\/li> \n  <li><b>Momentum and &#8220;animal spirits&#8221;:<\/b> irrationality is frequently self-reinforcing. When prices rise, more and more less sophisticated investors enter the market, creating momentum that pushes valuations even further from fair value, and crushing those betting on a return to sanity.<\/li> <\/ul>\n\n<p>The term \u2018solvent\u2019 in the quote is very important. It is about the investor\u2019s ability to stay alive (at a financial level). In finance, being insolvent is almost the same as being dead. The market does not have to be rational on your timeline; it only has to stay irrational long enough to exhaust your resources.<\/p>\n\n\n<h3>The GameStop (GME) Short Squeeze<\/h3>\n\n<p>The 2021 GameStop saga remains the most violent modern illustration of Keynes\u2019s warning. From a fundamental perspective, analysts were &#8220;right&#8221;: the company was a struggling brick-and-mortar retailer with a declining business model and falling revenues. However, &#8220;animal spirits&#8221; fueled by social media created a decoupled valuation where the stock price surged by over 2,700% in weeks. <\/p>\n\n<p>This irrationality triggered a short squeeze, a technical phenomenon where rising prices force short sellers to buy back shares to cover their positions. This involuntary buying creates a self-reinforcing loop: the more short sellers exit to limit losses, the higher the price climbs, triggering further margin calls. This had lethal solvency consequences: hedge funds like Melvin Capital, despite their sound fundamental thesis, were caught in a liquidity squeeze. They were crushed not by being wrong about the company, but by being insolvent before the market\u2019s timeline aligned with their own. This example highlights the brutal reality of timing: a short position has a &#8220;bleeding&#8221; cost that fundamental truth cannot always outrun.<\/p>\n\n\n<h2>Financial concepts linked to this quote<\/h2>\n\n<p>This quote is a perfect opportunity to go deeper into three financial concepts that you may find useful to know more about: short selling, the Efficient Market Hypothesis (EMH) and the time value of money and opportunity cost. <\/p>\n\n\n<h3>Short selling<\/h3> \n\n<p>To bet against an &#8220;overpriced&#8221; market, you can short sell something. If we keep the example of stocks, the idea is that you can borrow one Tesla share from someone, and then sell this share on the open market. If the price drops as you planned, you buy back the share for cheaper and give it back to its original owner, and pocket the difference (minus a borrowing fee for whoever owned the share).<\/p>\n\n<p>Unlike buying a stock, where your risk is limited to your initial investment (the stock can\u2019t be worth less than 0), shorting carries theoretically infinite risk, because <b>there is no ceiling on how high a price can climb<\/b>.<\/p>\n\n<p style=\"text-align:center\"> <img decoding=\"async\" src=\"https:\/\/www.simtrade.fr\/blog_simtrade\/wp-content\/uploads\/2026\/03\/img_short_selling.jpeg\" alt=\"Short selling explanation\" width=\"600\" style=\"margin-top:8px;border-radius:8px\"> <br>\n<small>Source : IG Group<\/small><\/p>\n\n<p>But maintaining a short position is not a passive endeavor; it is a &#8220;bleeding&#8221; process characterized by several layers of costs and pressure:<\/p>\n\n<ul>\n<li><b>Stock borrow fees:<\/b> shorting requires you to borrow shares from a lender. In highly speculative or &#8220;hard-to-borrow&#8221; markets, the interest rates on these loans can spike significantly, eroding your potential profits every day the market refuses to correct.<\/li>\n<li><b>Dividend liability:<\/b> if the company you are shorting pays a dividend, you need to pay this amount out of your own pocket to the person you borrowed the shares from.<\/li>\n<li><b>The short squeeze risk:<\/b> as an irrational market climbs, short sellers may be forced to buy back shares to cover their losses, creating even more buying pressure. If too many investors short-sold the stock, if they all want to buy back their positions at the same time, and if not enough shares are available on the market, prices can suddenly surge to absurd levels. This is what we discussed earlier with the GameStop example.<\/li>\n<\/ul>\n\n\n<h3>The Efficient Market Hypothesis (EMH) vs. the Keynesian reality<\/h3> \n\n<p>The Efficient Market Hypothesis (EMH) suggests that markets are always rational and instantaneously reflect all available information. Under this framework, there should not be any bubble in the market, because arbitrageurs would immediately correct any deviation from the &#8220;fair value&#8221;. Keynes\u2019 quote serves as a direct challenge to this theory: it suggests that while markets <i>should<\/i> be rational, they are frequently driven by &#8220;animal spirits&#8221;; the human emotions and herd behavior that makes people take irrational decisions.<\/p>\n\n<p>This creates a dangerous environment where the <b>fundamental value<\/b> remains decoupled from the <b>market price<\/b> for extended periods. This divergence is sustained by two primary factors that the EMH often overlooks:<\/p>\n\n<ul>\n<li><b>Noise trading:<\/b> Many participants buy based on trends, rumors, or social proof rather than data. This &#8220;noise&#8221; creates a momentum that rational analysis cannot easily break.<\/li>\n<li><b>The &#8220;Greater Fool&#8221; theory:<\/b> some (if not many) investors do not buy assets because they believe they are buying at a good price, but because they expect to be able to resell them at awhat we talked earlier higher price to someone else. Check out <a href=\"https:\/\/www.independent.co.uk\/tech\/nfts-crypto-currency-what-happened-b2886632.html\" target=\"_blank\">this article<\/a> to see the example of NFTs.<\/li> <\/ul>\n\n\n<h3>Time Value of Money &amp; Opportunity Cost<\/h3> \n\n<p>Identifying a 10% mispricing in the market is only half the work; you also need to actually profit from it. This means committing capital, and in finance, <b>capital is never free.<\/b> Every dollar tied up in a trade is a dollar that isn&#8217;t earning a return elsewhere. This means your trade must not only be &#8220;correct,&#8221; but it must also clear a specific <i>hurdle rate<\/i> to be considered a success.<\/p>\n\n<ul>\n<li><b>The risk-free benchmark &amp; opportunity cost:<\/b> in a rational portfolio, the baseline for any investment is the risk-free rate (typically the yield on 10-year treasury bonds for US investors, or German bunds for EU investors). If the risk-free rate is 3% per year, you need to earn significantly more than an annualized 3% on any given trade to justify the risk of not simply sitting in &#8220;safe&#8221; government debt.<\/li>\n<li><b>Time-adjusted returns:<\/b> a practical way to see if your trade actually generated a real return is to use proper discounting through the present value formula. It allows you to calculate what a future sum of money (what you will have after the trade) should be worth to you today, to better compute your time-adjusted returns:<\/li> <\/ul>\n\n<p><img decoding=\"async\" src=\"https:\/\/www.simtrade.fr\/blog_simtrade\/wp-content\/uploads\/2026\/03\/img_present_value_formula.jpg\" alt=\"PV Formula\" width=\"400\" style=\"margin-top:8px;border-radius:8px\"> <\/p>\n\n<p>As a final example, if you identify a 10% mispricing today, but it takes you four years for the market to correct while the risk-free rate is 3%, your &#8220;safe&#8221; alternative would have grown to roughly 112.5% of your initial capital. By making only 10%, you have technically <b>lost<\/b> 2.5% in relative wealth, despite being &#8220;right&#8221; about the market&#8217;s irrationality.<\/p>\n\n\n<h2>My view on this quote<\/h2> \n\n<p>In addition to the structural limits of arbitrage, this quote serves as a stark reminder of the dangers of <b>leverage<\/b>. Whether through margin accounts or derivatives, leveraging capital allows you to trade as if you had a much larger balance; however, this acts as a double-edged sword that multiplies both gains and losses.<\/p>\n\n<p>Because markets can stay irrational for an indefinite period, leverage significantly accelerates the path to insolvency. The market does not have to become rational on your specific timeline\u2014or even at all. This becomes particularly dangerous when market irrationality persists longer than your loan agreement, your margin maintenance requirements, or your hedge fund mandate allows.<\/p>\n\n<p>We see this frequently in highly speculative assets like cryptocurrencies or stocks with high price-to-earnings ratios, such as Palantir, MicroStrategy, or Tesla. You might be fundamentally correct that a specific valuation is a fantasy, but if you use borrowed money to bet against it, you are playing a high-stakes game. The house (the market) only needs to stay irrational one day longer than you can afford to pay your interest or meet your collateral calls.<\/p>\n\n\n<h2>Why should you keep this quote in mind?<\/h2> \n\n<p>For students, this is a vital warning against hubris. In your career, you will often see things that don&#8217;t make sense. You will be tempted to bet against them. But remember the following principles:<\/p>\n\n<ul>\n<li><b>Risk management is key:<\/b> never assume being &#8220;right&#8221; protects you from being &#8220;broke.&#8221; Always consider the possibility of being wrong for a very long time.<\/li>\n<li><b>The market is a voting machine:<\/b> in the short run, it doesn&#8217;t matter what the &#8220;fair value&#8221; is; what matters is what the average investor thinks. You most likely cannot sway the vote alone.<\/li> \n  <li><b>Solvency is survival:<\/b> the most successful professionals are not those who are the most &#8220;right,&#8221; but those who are still standing when the correction finally arrives.<\/li> <\/ul>\n\n<p>Ultimately, Keynes\u2019 warning reminds us that the market is a psychological arena as much as a mathematical one. Surviving irrationality is the only way to eventually profit from the rationality.<\/p>\n\n\n<h2>Related posts on the SimTrade blog<\/h2>\n\n<h3>Quotes<\/h3>\n\n<p>&#9654; <a href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/category\/quotes\/\">All posts about Quotes<\/a><\/p>\n\n<p>&nbsp;&nbsp;&nbsp;&#9654; Hadrien PUCHE <a href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/18-the-stock-market-is-designed-to-transfer-money-from-the-impatient-to-the-patient-warren-buffett\/\" target=\"_parent\">&#8220;The stock market is designed to transfer money from the impatient to the patient.&#8221; \u2013 Warren Buffett<\/a><\/p>\n\n<p>&nbsp;&nbsp;&nbsp;&#9654; Hadrien PUCHE <a href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/the-market-is-never-wrong-only-opinions-are-jesse-livermore\/\" target=\"_parent\"> The market is never wrong, only opinions are.&#8221; \u2013 Jesse Livermore<\/a><\/p>\n\n\n<p>&nbsp;&nbsp;&nbsp;&#9654; Hadrien PUCHE <a href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/the-four-most-dangerous-words-in-investing-are-its-different-this-time-john-templeton\/\" target=\"_parent\">\u201cThe four most dangerous words in investing are, it\u2019s different this time.\u201d \u2013 John Templeton<\/a><\/p>\n\n\n<h3>Financial techniques<\/h3>\n\n<p>&nbsp;&nbsp;&nbsp;&#9654; Ian DI MUZIO <a href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/leverage-lbo-how-debt-creates-destroys-value-private-equity-transactions\/\" target=\"_parent\"> Leverage in LBOs: How Debt Creates and Destroys Value in Private Equity Transactions<\/a><\/p>\n\n<p>&nbsp;&nbsp;&nbsp;&#9654; Rapha\u00ebl ROERO DE CORTANZE <a href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/gamestop-group-nostalgic-nerds-overturned-short-selling-strategy\/\" target=\"_parent\"> Gamestop: how a group of nostalgic nerds overturned a short-selling strategy<\/a><\/p>\n\n<p>&nbsp;&nbsp;&nbsp;&#9654; Lang Chin SHIU <a href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/lemming-effect-finance\/\" target=\"_parent\">The \u201clemming effect\u201d in finance<\/a><\/p>\n\n\n<h2>Useful resources<\/h2>\n\n<h3>Academic research<\/h3>\n\n<p> Shiller, R. J. (2000) <i>Irrational Exuberance<\/i>. Princeton: Princeton University Press.<\/p>\n\n<p>Keynes, J. M. (1936) <i>The General Theory of Employment, Interest, and Money<\/i>. London: Macmillan.<\/p>\n\n<p>Shleifer, A., Vishny, R. W. (1997) The Limits of Arbitrage <i>The Journal of Finance<\/i>, 52(1) 35-55.<\/p>\n \n\n<h3>Other resources<\/h3>\n\n<p>YouTube Video  <a href=\"https:\/\/www.youtube.com\/watch?v=d0nERTFo-Sk\" target=\"_blank\"> Fear the Boom and Bust: Keynes vs. Hayek &#8211; The Original Economics Rap Battle!<\/a>.<\/p>\n\n\n\n<h2>About the Author<\/h2> \n\n<p>This article was written in April 2026 by <a href=\"https:\/\/www.linkedin.com\/in\/hadrienpuche\" target=\"_blank\">Hadrien PUCHE<\/a> (ESSEC Business School, <i>Grande \u00c9cole<\/i> Program, Master in Management, 2023-2027).<\/p>\n\n<p>&nbsp;&nbsp;&nbsp;&#9654; Discover all articles by <a href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/author\/hpuche\/\" target=\"_parent\">Hadrien PUCHE<\/a><\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>Is it possible to be right too early? In the world of finance, the answer is often yes. We frequently assume that if our analysis is sound, and if the data is on our side, profit is inevitable. However, history is littered with brilliant minds who correctly identified a market bubble, but got crushed by &#8230; <a title=\"&#8220;Markets can remain irrational longer than you can remain solvent\u201d \u2013 John Meynard Keynes\" class=\"read-more\" href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/markets-can-remain-irrational-longer-than-you-can-remain-solvent-john-meynard-keynes\/\" aria-label=\"Read more about &#8220;Markets can remain irrational longer than you can remain solvent\u201d \u2013 John Meynard Keynes\">Read more<\/a><\/p>\n","protected":false},"author":163,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-18283","post","type-post","status-publish","format-standard","hentry","category-contributors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.3 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>&quot;Markets can remain irrational longer than you can remain solvent\u201d \u2013 John Meynard Keynes - SimTrade blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.simtrade.fr\/blog_simtrade\/markets-can-remain-irrational-longer-than-you-can-remain-solvent-john-meynard-keynes\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"&quot;Markets can remain irrational longer than you can remain solvent\u201d \u2013 John Meynard Keynes\" \/>\n<meta property=\"og:description\" content=\"Is it possible to be right too early? In the world of finance, the answer is often yes. We frequently assume that if our analysis is sound, and if the data is on our side, profit is inevitable. However, history is littered with brilliant minds who correctly identified a market bubble, but got crushed by ... 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