{"id":189279,"date":"2023-04-25T10:56:39","date_gmt":"2023-04-25T14:56:39","guid":{"rendered":"https:\/\/ibkrcampus.com\/?p=189279"},"modified":"2023-04-25T10:56:40","modified_gmt":"2023-04-25T14:56:40","slug":"game-on-social-networks-and-markets","status":"publish","type":"post","link":"https:\/\/www.interactivebrokers.com\/campus\/ibkr-quant-news\/game-on-social-networks-and-markets\/","title":{"rendered":"Game On: Social Networks and Markets"},"content":{"rendered":"\n<p><em>The article &#8220;Game On: Social Networks and Markets&#8221; first appeared on <a href=\"https:\/\/alphaarchitect.com\/2023\/04\/social-networks-and-markets\/\">Alpha Architect blog<\/a>.<\/em><\/p>\n\n\n\n<p>This article studies how investment ideas can propagate through a social network and affect market behavior and prices.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Game On: Social Networks and Markets<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pedersen, Lasse Heje<\/li>\n\n\n\n<li>Journal of Financial Economics, 2022<\/li>\n\n\n\n<li>A version of this paper can be found&nbsp;<a href=\"https:\/\/papers.ssrn.com\/sol3\/papers.cfm?abstract_id=3794616\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><\/li>\n\n\n\n<li>Want to read our summaries of academic finance papers? Check out our&nbsp;<a href=\"https:\/\/alphaarchitect.com\/category\/architect-academic-insights\/academic-research-insight\/\" target=\"_blank\" rel=\"noreferrer noopener\">Academic Research Insight<\/a>&nbsp;category<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-are-the-research-questions\">What are the Research Questions?<\/h2>\n\n\n\n<p>Communication in social networks is not new. In fact, it goes back to coffee houses in the 17th century. According to Standage (2006), \u201c<em>the drama of the South Sea Bubble, a fraudulent investment scheme that collapsed in September 1720, ruining thousands of investors, was played out in coffeehouses.<\/em>\u201d<\/p>\n\n\n\n<p>The author ask the following questions:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>How do social networks affect asset markets?<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Academic Insights?<\/h2>\n\n\n\n<p>The author answers the above research question by proposing a theoretical model that shows how investment ideas can propagate through a social network and affect&nbsp;<a href=\"https:\/\/alphaarchitect.com\/2016\/05\/behavioral-finance-strikes-again-contrast-effects-in-financial-markets\/\">market behavior<\/a>&nbsp;and prices. It uses GameStop as a case study for this model.<\/p>\n\n\n\n<p>The model is an augmented De Groot (1974), where the author introduces rational learners to capture the effects of sophisticated professional investors (or arbitrageurs). In fact, in this model, there are three types of agents: naive, fanatics, and rationals. Rational agents initially listen to all available information. However, once they process all the information, they become completely \u201cstubborn\u201d in the sense that seeing a different view presented again and again does not sway the rational agent if the different view does not contain any new information. Similarly, fanatics agents can be stubborn and influence other (naive) agents. Investors differ in their reliance on rational or fanatic views. The aggregate importance (or \u201cthought leadership\u201d) of each stubborn view is the sum-product of the attention it gets from its followers and the \u201cinfluencer values\u201d of its followers. Another difference with the standard De Groot model is that here a consensus is never reached, and the focus is on the average opinion.<\/p>\n\n\n\n<p>GameStop<\/p>\n\n\n\n<p>In early 2021, Game Stop (the world\u2019s largest video game retailer) struggled as games were increasingly sold online and the Covid-19 crisis hit the retail industry. Nonetheless, a group of investors (including Keith Gill, one the most followed ) captured a trend reinforced through social networks, especially on Reddit (sub-community: WallStreetBets). Fanatics signaled their bullishness using a \u201crocket\u201d* meme**. On top of this, Elon Mask (the influencer who follows the fanatics) tweeted a link to WallStreetBets that increased interest in the stock. The stock price increased by orders of magnitude with enormous trading volume (incentivized by the zero commission online broker Robinhood, which uses a business model based on payment for order flow from market makers such as Citadel) and volatility, coinciding with an increase in social media attention.<\/p>\n\n\n\n<p>The stock started 2021 at $19 per share and hit an intra-day high of $483 on January 28, a 25-fold increase with little news. The price dropped to $40 in February but increased significantly again in late February, and stayed above $100 for the rest of 2021. Realized volatility for the year was exceptionally high at over 700%. As the stock price of GameStop rose in late January, some shortsellers were simultaneously forced to close their positions, buying shares they borrowed earlier. This reduction in short positions further pushed the price upward (a \u201cshort squeeze\u201d). This short squeeze likely played a role in the price spike in January. Still, it was not a significant driver of the subsequent price rise that started in late February 2021, suggesting the importance of social network effects.<\/p>\n\n\n\n<p>The GameStop saga presented many of the elements included in the model: an investment thesis that spreads via a social network while fanatic views escalate, the contagious investment idea leads to network effects on prices, which starts a bubble, and prices rise further as influencers link to the fanatics. In the meantime, sophisticated momentum investors ride the bubble. In contrast, value investors bet against it, causing high trading volume and volatility, but it all dies down faster than the&nbsp;<a href=\"https:\/\/alphaarchitect.com\/2022\/03\/are-stock-market-bubbles-identifiable\/\">price bubble.<\/a><a href=\"https:\/\/ourworldindata.org\/brief-history-of-ai#language-and-image-recognition-capabilities-of-ai-systems-are-now-comparable-to-those-of-humans\"><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-does-this-study-matter\">Why does this study matter?<\/h2>\n\n\n\n<p>This paper presents an innovative model that helps explain social network effects in portfolio holdings, excess volatility, momentum, and reversal effects, meme trading, the effects of repeated news, and spillover of expectations and transaction prices across people with social links. GameStop is the perfect example to explain the model empirically.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-most-important-chart-from-the-paper\">The Most Important Chart from the Paper:<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/04\/2023-04-05-10_28_33-GameOn_SocialNetworksAndMarkets_powerpoint-alpha-architect.png\" alt=\"\" class=\"wp-image-189281 lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><figcaption class=\"wp-element-caption\"><em>The results are hypothetical results and are NOT an indicator of future results and do NOT represent returns that any investor actually attained.&nbsp; Indexes are unmanaged and do not reflect management or trading fees, and one cannot invest directly in an index.<\/em><\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" data-src=\"\/campus\/wp-content\/uploads\/sites\/2\/2023\/04\/2023-04-05-13_57_37-SSRN-id3794616-2-alpha-architect.png\" alt=\"\" class=\"wp-image-189283 lazyload\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><figcaption class=\"wp-element-caption\">The results are hypothetical results and are NOT an indicator of future results and do NOT represent returns that any investor actually attained.&nbsp; Indexes are unmanaged and do not reflect management or trading fees, and one cannot invest directly in an index.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-abstract\">Abstract<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>I present closed-form solutions for prices, portfolios, and beliefs in a model where four types of investors trade assets over time: naive investors who learn via a social network, \u201cfanatics\u201d possibly spreading fake news, and rational short- and long-term investors. I show that fanatic and rational views dominate over time, and their relative importance depends on their following by influencers. Securities markets exhibit social network spillovers, large effects of influencers and thought leaders, bubbles, bursts of high volume, price momentum, fundamental momentum, and reversal. The model sheds new light on the GameStop event, historical bubbles, and asset markets more generally.<\/p>\n<\/blockquote>\n\n\n\n<p>*Social-media investors sometimes signal a strong potential rise in price of a stock by using a rocket emoji<\/p>\n\n\n\n<p>**A \u201cmeme\u201d is an idea that becomes a fad and spreads by means of imitation in a social network<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Communication in social networks is not new. In fact, it goes back to coffee houses in the 17th century. <\/p>\n","protected":false},"author":152,"featured_media":146646,"comment_status":"open","ping_status":"closed","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[339,338,341],"tags":[3689,72,15161],"contributors-categories":[13651],"class_list":{"0":"post-189279","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-science","8":"category-ibkr-quant-news","9":"category-quant-development","10":"tag-game-on","11":"tag-markets","12":"tag-social-networks","13":"contributors-categories-alpha-architect"},"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Game On: Social Networks and Markets | IBKR Quant<\/title>\n<meta name=\"description\" content=\"Communication in social networks is not new. 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