AGNOSTIC Papers

AgPa #3: Measuring the World’s Assets (1/2)

The Global Market Portfolio (2021)
Gregory Gadzinski, Markus Schuller, Andrea Vacchino
The Journal of Portfolio Management 47(8), 151-163, URL

This week’s AGNOSTIC Paper attempts to translate an important theoretical concept into practice – the global market portfolio.

The global market portfolio captures all available assets and each is weighted by its market value. The authors develop two proxies for this portfolio and present some interesting insights:

  • Global assets were worth about $667T in 2019
  • The investable market portfolio returned 4.7% p.a. from 2005-2020/Q1
  • The non-investable market portfolio returned 5.9% p.a. from 2005-2020/Q1

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AgPa #2: What Moves Stock Prices?

What Moves Stock Prices? The Role of News, Noise, and Information (2022)
Jonathan Brogaard, Thanh Huong Nguyen, Talis J. Putnins, Eliza Wu
The Review of Financial Studies, Forthcoming, URL

This week’s AGNOSTIC Paper attempts to answer a very fundamental question: What drives the day-to-day volatility of stock prices? Of course, there are many things active at the same time. News about the underlying businesses, news about the economy, market impact of large investors, and various more.

The authors develop a novel model to isolate the impact of those different types of information. They also applied it to the US stock market and derive some interesting results:

  • Stock-Specific information is most important
  • Markets became more efficient over time
  • Smaller stocks are more noisy

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AgPa #1: Index Whales

Index Providers: Whales Behind the Scenes of ETFs (2021)
Yu An, Matteo Benetton, Yang Song
Invited for submission to the Review of Financial Studies, URL

The first research paper examines a specific area of the asset management industry: Exchange Traded Funds (ETFs) and index providers, the companies selling market indices like the S&P 500.

In a remarkable combination of empirical analysis and theoretical modeling, the authors present several interesting results:

  • Index providers are an oligopoly
  • ETF investors care about the index
  • Index providers capture 1/3 of ETF fees
  • Index providers are extremely profitable

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AGNOSTIC Papers: Introduction

The idea of AGNOSTIC Papers is to combine theory and practice by presenting one research paper per week. The papers should provide scientifically robust insights that are relevant and applicable to real-world investing. More details about it in this brief introduction.

Of course, you are more than welcome to follow the series and share your comments!

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