Paper: arXiv 2412.00468

Authors: Nick James, Max Menzies

Abstract

This paper studies the time-varying structure of the equity market with respect to market capitalization. First, we analyze the distribution of the 100 largest companies’ market capitalizations over time, in terms of inequality, concentration at the top, and overall discrepancies in the distribution between different times. In the next section, we introduce a mathematical framework of linear and nonlinear functionals of time-varying portfolios. We apply this to study the market capitalization exposure and spread of optimal portfolios chosen by a Sharpe optimization procedure. These methods could be more widely used to study various measures of optimal portfolios and measure different aspects of market exposure while holding portfolios selected by an optimization routine that changes over time.

Complexity vs Empirical Score

  • Math Complexity: 5.5/10
  • Empirical Rigor: 6.5/10
  • Quadrant: Holy Grail — high math complexity, high empirical rigor

Why this score: The paper presents an interesting framework using 1-Wasserstein distance, Gini coefficients, and concentration ratios to measure structural market imbalance and market cap concentration over time. The mathematical formulations are clear and accessible, accompanied by clean empirical application on 20 years of stock data, though additional backtested portfolio implementation results would strengthen the empirical depth.

Research Flowchart

  flowchart TD
    A[Research Goal: Detect Imbalanced Markets via Time-Varying Portfolios] --> B[Data Input: Market Cap of Top 100 Companies Over Time]
    
    subgraph Methodology & Processing
        B --> C[Analyze Market Cap Distribution: Inequality & Concentration]
        B --> D[Apply Mathematical Framework: Linear & Nonlinear Functionals]
        D --> E[Sharpe Optimization Procedure on Time-Varying Portfolios]
    end

    C --> F[Outcomes: Quantified Market Concentration & Dynamic Portfolio Exposure]
    E --> F

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  423. Cryptocurrencies Are Becoming Part of the World Global Financial Market — → 2303.00495
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  491. How George Floyd Died, and What Happened Next (2022)
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  510. Uneven vaccination rates across the US linked to C ovid-19 case trends, worry experts (2021)
  511. Wall S treet Mines A pple and G oogle Mobility Data to Spot Revival (2020)
  512. New Z ealand, A ustralia tighten lockdown to combat coronavirus (2020)
  513. Sweden adds further restrictions on outdoor gatherings as coronavirus cases hit record highs (2020)
  514. Coronavirus: Is it time to move on and get back to normal life?
  515. Why the second wave of C ovid-19 appears to be less lethal
  516. Coronavirus: US and A ustralia close borders to C hinese arrivals
  517. Test, trace, contain: how S outh K orea flattened its coronavirus curve
  518. China becomes first major economy to recover from C ovid-19 pandemic
  519. How coronavirus almost brought down the global financial system (2020)
  520. Italy’s Virus Shutdown Came Too Late. What Happens Now?
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  522. How G reece is rethinking its once bustling tourism industry
  523. New Z ealand has 69 active C ovid cases after 13 more diagnosed
  524. A Devastating New Stage of the Pandemic
  525. First and Second Waves of Coronavirus
  526. UPDATED: Timeline of the C oronavirus
  527. This is where each state is during its phased reopening
  528. All 50 U.S. states have taken steps toward reopening in time for Memorial Day weekend
  529. Thinking Globally, Acting Locally - The U.S. Response to C ovid-19 (2020) — link
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  531. Georgia’s Governor Issues Order Rescinding Local Mask Mandates (2020)
  532. Florida shatters single-day infection record with 15,300 new cases (2020)
  533. U.S. COVID-19 Deaths Near 130,000; F lorida And T exas Report Record Case Numbers (2020)
  534. Gov. Greg Abbott orders T exans in most counties to wear masks in public (2020)
  535. California tells six additional counties to close indoor businesses, all bars (2020)
  536. New Y ork Orders Residents to Wear Masks in Public (2020)
  537. Countries turn to rapid antigen tests to contain second wave of COVID -19 (2020)
  538. Analysis: Could COVID knock out flu in E urope this winter?
  539. Prise en charge par les m 'e dicins de ville des patients atteints de COVID -19 en phase de d 'e confinement (2020)
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  543. Britain Drops Its Go-It-Alone Approach to Coronavirus (2020)
  544. Italy coronavirus death toll to 107, 3089 cases: Live updates (2020)
  545. Brazil has record new coronavirus cases, surpasses F rance in deaths (2020)
  546. France Announces Further Reopening Amid Declining Number Of Coronavirus Cases (2020)
  547. Global coronavirus cases hit 20 million as pandemic accelerates (2020)
  548. Here’s What Caused Bitcoin’s ‘Extreme’ Price Plunge (2020)
  549. Why Did FTX Collapse? H ere’s What to Know. (2022)
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  575. Distributional trends in the generation and end-use sector of low-carbon hydrogen plants (2023) — link
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  583. Equivalence relations and $L^p$ distances between time series with application to the B lack S ummer A ustralian bushfires (2023) — link
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6 of 946 cited works are in the corpus; resolved via arXiv source bundles, Semantic Scholar and OpenAlex. Corpus-wide: 2518 linked papers.