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Book Review: How Novelty and Narratives Drive the Stock Market

by Mark S. Rzepczynski
February 19, 2022
in Investing
Reading Time: 6 mins read
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How Novelty and Narratives Drive the Inventory Market: Black Swans, Animal Spirits and Scapegoats. 2021. Nicholas Mangee. Cambridge College Press.


“The place there’s novelty, there’s instability. The place there’s instability there’s uncertainty. The place there’s uncertainty there are narratives — narratives are the foreign money of uncertainty.”

Nicholas Mangee, affiliate professor of finance within the Parker Faculty of Enterprise at Georgia Southern College, begins How Novelty and Narratives Drive the Inventory Market with a press release that encompasses the issue he tackles and the compelling purpose for investor curiosity within the new-style considering that addresses it.

This detailed inventory market research makes an attempt to increase Nobel Prize-winner Robert Shiller’s improvement of narrative economics, albeit Mangee’s focus is on novelty info embedded in textual information narratives. Utilizing a set of text-based indices to seize the uncertainty and ambiguity in unscheduled information, Mangee measures the influence of reports narratives on fairness conduct.

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Information experiences are tales and narratives containing distinctive info that can’t simply be handicapped or assigned likelihood estimates for quantifying danger. This novel info confronts buyers with “Knightian uncertainty” (i.e., the lack to measure possibilities of future states, as described by the Chicago economist Frank Knight). Molding advances in textual evaluation and categorization into a way for measuring nonquantitative info that impacts fairness costs, Mangee enriches the dialogue of inventory worth conduct by together with the mountains of novel and unscheduled info contained in information experiences. Making an attempt to categorize and measure the influence of reports and the accompanying narrative is a frightening activity, however this guide gives a major development effectively price an investor’s time.

Textual evaluation by means of pure language processing and machine studying, which has moved past the conventional scheduled announcement of macro and firm-specific info, has grow to be the reducing fringe of quantitative monetary analysis. Mangee hyperlinks this evaluation to the brand new conception of narrative economics as a driver of sentiment and expectations. He focuses on measurement of uncertainty and ambiguity to boost our information of inventory drivers past usually scheduled and repeatable information. Inventory market volatility and adjustments in issue conduct are proven to be linked to the stream of distinctive info that’s collected in monetary information reporting.

The guide begins with what is named the novelty-narrative speculation (NNH) and hyperlinks this idea with Knightian uncertainty. The NNH states that unscheduled and distinctive info, which comes within the type of narratives, can’t be simply handicapped however can nonetheless have an effect on inventory conduct. Novel, rare, and unscheduled info is topic to interpretation by means of narratives or tales in our monetary press as a result of there is no such thing as a great way of changing this info into measurable dangers. These novel narratives affect inventory conduct despite the fact that they characterize explanations of unsure occasions.

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For Mangee, the hyperlink between distinctive information and inventory market prediction, an space not normally researched, can provide explanations for heightened volatility, breaks in mannequin conduct, and parameter uncertainty. Distinctive textual info and novel information may be systemized, encoded, and bundled into classes and indices to offer significant info that may help our understanding of inventory conduct. Utilizing a long time of knowledge from main information organizations, the creator kinds what he calls Knightian Uncertainty (KU) indices for macro and micro (i.e., firm-level) information.

Mangee first introduces us to textual evaluation utilizing Google traits and phrase cluster maps to exhibit how funding themes change in monetary information. What captures the eye of reports companies in a given interval could fluctuate markedly over time. From this high-level evaluation, the creator employs the RavenPack information analytic platform for categorizing textual evaluation into macro and micro information classes. These are additional divided into uncertainty, sentiment, novelty, relevance, and mixture occasion quantity indices primarily based on completely different characterizations for categorizing information occasions. The ensuing categorizations characterize a large effort of taking info from thousands and thousands of tales by quite a few information reporting companies throughout a long time to type tons of of clusters that may be aggregated primarily based on stock-based significance. Thousands and thousands of latest tales are grouped and categorized into near 1,400 occasion classes to type indices as instruments for measuring varied types of uncertainty.

These textual info indices are related to swings in inventory market volatility. Fairness volatility will not be pushed solely by surprises in scheduled information but in addition by the broad set of unscheduled and random novel information that may translate into market reactions. For instance, will increase in KU indices, which measure novel narrative information, result in will increase in inventory volatility. Regime adjustments in fairness types and conduct, in addition to mannequin parameter adjustments, may be related to fluctuations in unscheduled distinctive info that’s embedded in our information narratives. Learning unscheduled swings in novel information gives a window into market instability that improves our understanding of inventory market complexity. What’s related to buyers will change by means of time, primarily based on sentiment and focus.

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This prolonged guide is directed at an instructional viewers and addresses a number of refined analysis matters involving uncertainty and textual content narratives, however its core conclusions and message are accessible for many finance professionals. Scheduled and measurable information issues, however so does the continuous stream of commentary and interpretation of the distinctive info that enters markets every single day. Detailed and exhaustive evaluation of textual information offers new that means to market sentiment and the influence of reports on inventory costs.

Exploring fairness reactions by means of the conversion of textual narratives into measurable indices ought to be an space of maximum curiosity for a lot of buyers serious about understanding market volatility. It constitutes a brand new course for probably cracking the code for inventory market prediction. Mangee gives a stable introduction to a novel strategy to explaining fairness instability; nonetheless, the complexity of sorting by means of all the information and trying to present it that means remains to be in its infancy and never simply convertible into funding guidelines. From novelty comes narrative and uncertainty, however the reader will nonetheless ask the query, what subsequent?

For those who appreciated this put up, don’t overlook to subscribe to the Enterprising Investor.


All posts are the opinion of the creator. As such, they shouldn’t be construed as funding recommendation, nor do the opinions expressed essentially replicate the views of CFA Institute or the creator’s employer.


Skilled Studying for CFA Institute Members

CFA Institute members are empowered to self-determine and self-report skilled studying (PL) credit earned, together with content material on Enterprising Investor. Members can file credit simply utilizing their on-line PL tracker.



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