Research


Research Focus: Uncovering Financial Insights through Data-Driven Analysis

Bastien's research is dedicated to exploring the multifaceted world of finance through a data-driven lens. His investigations encompass the financial stability implications of crypto-assets within the broader financial system and innovative investment strategies utilizing crypto-assets. Further, his reasearch around empirical asset pricing investigates model-free short-term predictors derived from high frequency data. Lastly, his interest of Sustainable Finance materalizes in two distinct lines of thinking: alternative taxation of financial markets to foster sustainable investments and local currencies to implement sustainable growth.

  1. Financial Stability and Crypto-assets: Bastien's research critically examines the intricate dynamics of financial stability concerning crypto-assets within the broader financial system. Employing data-driven methodologies, he seeks to unveil the complex connections and potential risks associated with these digital assets, contributing to a more comprehensive understanding of contemporary financial stability.
  2. Alternative Investment Strategies with Crypto-assets: Bastien dedicates his efforts to pioneering data-driven alternative investment strategies harnessing the potential of crypto-assets. His research extends beyond conventional approaches, providing quantitative insights that redefine asset allocation, risk management, and portfolio optimization in today's evolving investment landscape.
  3. Empirical Asset Pricing and High-Frequency Data Analysis: Bastien's expertise extends to empirical asset pricing, with a specialized focus on high-frequency data analysis. His research involves the meticulous decomposition of return distributions, unraveling intricate patterns and anomalies that shape asset valuations.
  4. Sustainable Finance: Bastien's interest in sustainable finance manifests in two distinct lines of thinking. Firstly, he explores the concept of alternative taxation for financial markets to encourage sustainable investments. Secondly, he contemplates the potential of local currencies as a means to implement sustainable growth. While these ideas are currently in their conceptual stage, they represent Bastien's vision for the future of Sustainable Finance.

By converging his passion for finance and data science, Bastien aspires to position himself as a dedicated data scientist in the field. His research not only contributes to our understanding of financial markets but also equips stakeholders with data-driven strategies to thrive in an increasingly intricate and digitalized financial landscape.


Research Papers

Clustered Network Connectedness: A New Measurement Framework, with Application to Global Equity Markets, mimeo, February 2025 (with F.X. Diebold and K. Yilmaz).

Network connections, both across and within markets, are central in countless economic contexts. In recent decades, a large literature has developed and applied flexible methods for measuring network connectedness and its evolution, based on variance decompositions from vector autoregressions (VARs), as in Diebold and Yilmaz (2014). Those VARs are, however, typically identified using full orthogonalization (Sims, 1980), or no orthogonalization (Koop, Pesaran, and Potter, 1996; Pesaran and Shin, 1998), which, although useful, are special and extreme cases of a more general framework that we develop in this paper. In particular, we allow network nodes to be connected in "clusters", such as asset classes, industries, regions, etc., where shocks are orthogonal across clusters (Sims style orthogonalized identification) but correlated within clusters (Koop-Pesaran-Potter-Shin style generalized identification), so that the ordering of network nodes is relevant across clusters but irrelevant within clusters. After developing the clustered connectedness framework, we apply it in a detailed empirical exploration of sixteen country equity markets spanning three global regions.


Asymmetries at the core of short-term return predictability, mimeo, January 2025 (with J. Breckenfelder and R. Tédongap).
  • Show Abstract

We propose a novel approach to improve short-term equity return predictability by analyzing truncated high-frequency return distributions. We segment returns into core and tail components, focusing on core and tail asymmetries — differences between `typical' or `extreme' upside and downside variances. Our empirical findings show that these predictors achieve an in-sample adjusted R^2 of about 7% and an out-of-sample R^2 exceeding 3% for one-month-ahead market return forecasts, outperforming traditional predictors such as valuation ratios and the variance risk premium. It is the core asymmetry, rather than the tail asymmetry that drives the predictive power.


How to Optimally Structure and Rebalance a Crypto-asset Portfolio?, Finance Research Letters, 73, 106531, forthcoming 2025 (with J. Proelss and D. Schweizer).
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The cryptocurrency market operates continuously, leading to frequent price fluctuations and information dissemination. This can hinder investors from reacting promptly to market changes, a phenomenon attributed to investors' limited attention. Research in traditional markets shows that the limited attention bias allows successful implementation of momentum strategies. However, past research on cryptocurrency markets finds mixed results. To resolve the puzzle, we utilize a survivorship bias-free dataset while accounting for variations in market capitalization and trading volume. This differentiation is crucial given young and tech affine retail investors' inclination toward smaller-capitalized cryptocurrencies, due to their higher risk tolerance and limited attention. More risk averse investors such as institutional investors, in contrast, focus more on top cryptocurrencies. In line with expectations, we find effective momentum strategies among larger-capitalized cryptocurrencies.


Decrypting Crypto-assets: Introduction to an Emerging Asset Class, mimeo, August 2024 (with J.-M. Maeso and V. Milhau)
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Crypto-assets constitute a large and heterogenous asset class. Only a minority of crypto-assets qualify as crypto-currencies, while the large majority provide services that go beyond Bitcoin’s peer-to-peer payment system pioneered by Nakamoto (2008). This paper introduces a comprehensive taxonomy spanning crypto-currencies, service crypto-assets, smart-contract platforms, distributed applications and tokenized assets (including both fungible and non-fungible tokens). To illustrate stylized facts and capture various risks of the cross-section of crypto-assets this paper relies on a novel dataset covering more than 14,000 crypto-assets.



Conferences, Seminars and Panels

2023 Cryptocurrency Research Conference, Monaco, Monaco
Digital, Innovation, Financing and Entrepreneurship Conference, Montreal, Canada
Forecasting Financial Markets, University of Rennes, Rennes, France
Cross Country Perspectives in Finance Conference, Paphos, Cyprus*
French Inter Business School Finance Conference, Toulouse, France*
Finance Seminar, University of St. Gallen, St. Gallen, Switzerland*
Finance Seminar, University of Luxembourg, Luxembourg, Luxembourg*
Finance Seminar, Rennes School of Business, Rennes, France*
2022 Finance Seminar, Concordia University, Montreal, Canada
Asset Pricing Breakfast, ESSEC Business School, Paris, France*
Finance Seminar, SKEMA Business School, Paris, France*
Panelist at Décryptons les cryptos, FrenchTec, Montreal, Canada
Cardiff FinTech Conference, Cardiff University, Cardiff, UK
Future of Finance, Suzhou University, Suzhou, China
FinTech Workshop, Inseec Research Center, Lyon, France
2021 Panelist at Cryptocurrency and Fund Performance, CAIA, Geneva, Switzerland
2020 Finance Seminar, NEOMA Business School, Paris, France
Finance Seminar, Boston University, Boston, USA
2019 Paris December Finance Meeting, Paris, France
Finance Seminar, ESSEC Business School, Paris, France
Finance Seminar, Bank of Canada, Ottawa, Canada
CEMA Annual Meeting, Carnegie Mellon University, Pittsburgh, USA
Asset and Risk Management, Amundi, Paris, France
Finance PhD Workshop, Université Paris-Dauphine, Paris, France
Fintech Adoption and Economic Behavior, EM Strasbourg, Strasbourg, France
2018 Finance Seminar, ESSEC Business Scholl, Paris, France
Computational and Financial Econometrics, University of Pisa, Pisa, Italy
FinTech and Crypto-Finance, NEOMA Business School, Paris, France

* presented by a coauthor