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Research

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Research Interests

  • Game Theory: artificial intelligence, multi-agent systems, blockchains, markets, dynamics, voting
  • Operations Research: pricing, queueing theory

Journal Publications

  1. S. Leonardos, E. Petrakis, P. Skartados & G. Stamatopoulos, Partial Passive Ownership Holdings and Licensing, Economics Letters, (2021). [DOI]
  2. S. Leonardos, C. Melolidakis & C. Koki, Monopoly Pricing in Vertical Markets with Demand Uncertainty, Annals of Operations Research, (2021). [DOI]
  3. S. Leonardos & C. Melolidakis, On the Mean Residual Life of Cantor-Type Distributions: Properties and Economic Applications, Austrian Journal of Statistics, (2021). [DOI]
  4. Y. Dimitrakopoulos, A. Economou and S. Leonardos, Strategic customer behavior in a queueing system with alternating information structure, European Journal of Operational Research, (2020). [DOI]
  5. S. Leonardos, D. Reijsbergen & G. Piliouras, PRESTO: A Systematic Framework for Blockchain Consensus Protocols, IEEE Transactions in Engineering Management, (2020). [DOI] [Best paper award]
  6. S. Leonardos & C. Melolidakis, On the  Equilibrium Uniqueness in Cournot Competition with Demand Uncertainty, The B.E. Journal of Theoretical Economics, (2020). [DOI]
  7. V. Buterin, D. Reijsbergen, S. Leonardos & G. Piliouras, Incentives in Ethereum’s Hybrid Casper Protocol, International Journal of Network Management, (2020). [DOI]
  8. S. Leonardos, D. Reijsbergen, G. Piliouras, Weighted Voting on the Blockchain: Improving Consensus in Proof of Stake Protocols, International Journal of Network Management, (2020). [DOI]
  9. S. Leonardos & C. Melolidakis, Endogenizing the cost parameter in Cournot oligopoly, International Game Theory Review, (2020). [DOI]
  10. C. Koki, S. Leonardos and G. Piliouras, Do Cryptocurrency Prices Camouflage Latent Economic Effects? A Bayesian Hidden Markov Approach, MDPI Future Internet, (2020). [DOI]
  11. S. Leonardos & C. Koki, Coalitions & Voting Power in the Greek Parliament of 2012: A Case Study, Homo Oeconomicus, (2019). [DOI]
  12. S. Leonardos & C. Melolidakis, On the commitment value and commitment optimal strategies in bimatrix games, International Game Theory Review, (2018). [DOI]

Conference Publications

  1. Y.K. Cheung, S. Leonardos & G. Piliouras, Learning in Markets: Greed Leads to Chaos but the Price is Right, [IJCAI-21] The 30th International Joint Conference on Artificial Intelligence (2021). [arXiv]
  2. S. Leonardos & G. Piliouras, Exploration-Exploitation in Multi-Agent Learning: Catastrophe Theory Meets Game Theory, [AAAI-21] The 35th AAAI Conference on Artificial Intelligence (2021). [arXiv] [Best paper award]
  3. S. Leonardos, I. Sakos, C. Courcoubetis & G. Piliouras, Catastrophe by Design in Population Games: Destabilizing Wasteful Locked-in Technologies, [WINE-20] The 16th Conference on Web and Internet Economics (2020). [arXiv]
  4. C. Koki, S. Leonardos and G. Piliouras, Do Cryptocurrency Prices Camouflage Latent Economic Effects? A Bayesian Hidden Markov Approach, The 3rd Annual Decentralized Conference, (2019). [DOI] [Best paper award]
  5. S. Leonardos, N. Leonardos and G. Piliouras, Oceanic Games: Centralization Risks and Incentives in Blockchain Mining,  in International Conference on Mathematical Research for Blockchain Economy, (2019). [DOI] [Best paper award]
  6. S. Leonardos, D. Reijsbergen and G. Piliouras, Weighted Voting on the Blockchain: Improving Consensus in Proof of Stake ProtocolsIEEE – International Conference on Blockchain and Cryptocurrency, (2019). [DOI] [Best paper award]
  7. V. Buterin, D. Reijsbergen, S. Leonardos and G. Piliouras, Incentives in Ethereum’s Hybrid Casper Protocol, IEEE – International Conference on Blockchain and Cryptocurrency, (2019). [DOI]

Refereed Workshops – Book Chapters

  1. S. Leonardos, W. Overman, I. Panageas & G. Piliouras, Global Convergence of Multiagent Policy Gradient in Markov Potential Games, ICML Workshop on Reinforcement Learning, (2021). [arXiv]
  2. Y.K. Cheung, S. Leonardos, G. Piliouras & S. Sridhar, Allocation of Mining Resources in the Blockchain Economy, appears in [WINE 2020] Workshop on Game Theory in Blockchain, (2020) [extended abstract].
  3. B. Monnot, Q. Z. Hum, C.S. M. Koh, S. Leonardos & G. Piliouras, Ethereum’s Transaction Fee Reform in EIP 1559, appears in [WINE 2020] Workshop on Game Theory in Blockchain, (2020) [extended abstract].
  4. S. Leonardos & C. Koki, Coalition Governments in Germany & Greece: Are they on the same path? German-Greek Yearbook of Political Economy vol.3 p:5-29, invited (2020). [article]
  5. C. Koki, S. Leonardos & C. Melolidakis, Comparative Statics via Stochastic Orderings in a Two-Echelon Market with Upstream Demand UncertaintyAIRO Springer Series, (2019). [DOI]
  6. C. Koki, S. Leonardos & C. Melolidakis, Measuring Market Performance with Stochastic Demand: Price of Anarchy and Price of Uncertainty, LNCS/LNAI Springer Series, (2018). [DOI]

Working Papers

  • C. Koki, S. Leonardos & G. Piliouras, Exploring the Predictability of Cryptocurrencies via Bayesian Hidden Markov Models, minor revision in Research in International Business and Finance (reviews available). [arXiv]
  • S. Leonardos, B. Monnot, D. Reijsbergen, S. Skoulakis & G. Piliouras, Dynamical Analysis of the EIP-1559 Ethereum Fee Market. [arXiv]
  • Y.K. Cheung, S. Leonardos & G. Piliouras, From Griefing to Stability in Blockchain Mining Economies, under review. [arXiv], [ethresear.ch]
  • S. Leonardos, G. Piliouras & K. Spendlove, Exploration-Exploitation in Multiagent Competition: Convergence with Bounded Rationality, under review. [arXiv]
  • S. Leonardos, I. Sakos, C. Courcoubetis & G. Piliouras, Catastrophe by Design in Population Games: Destabilizing Wasteful Locked-in Technologies, (journal version). [arXiv]
  • C. Koki, S. Leonardos and G. Piliouras, A Peek into the Unobservable: Hidden States and Stylized Facts for the Bitcoin and Ether Price Series. [arXiv]
  • S. Leonardos & C. Melolidakis, A Class of Distributions for Linear Demand Markets. [arXiv]

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