Sergei Glebkin

Assistant Professor of Finance,

Finance Theory Group Member

CEPR Research Affiliate



Funding Constraints and Informational Efficiency (with Naveen Gondhi & John Kuong),

Review of Financial Studies (2021), 34(9): 4269-4322.

We analyze a tractable rational expectations equilibrium model with margin constraints. We argue that constraints affect and are affected by informational efficiency, leading to a novel amplification mechanism. A decline in wealth tightens constraints and reduces investors’ incentive to acquire information, lowering price informativeness. Lower informativeness, in turn, increases the risk borne by financiers who fund trades, leading them to further tighten constraints faced by investors. This information spiral leads to (i) significant increases in risk premium and return volatility in crises, when investors’ wealth declines, (ii) complementarities in information acquisition in crises, and (iii) complementarities in margin requirements.

Simultaneous Multilateral Search (with Ji Shen and Bart Zhou Yueshen),

Review of Financial Studies (2023), 36(2): 571-614

This paper studies simultaneous multilateral search (SMS) in over-the-counter (OTC) markets: when searching, an investor contacts several potential counterparties and then trades with the one offering the best quote. Search intensity (how frequently one can search) and search capacity (how many potential counterparties one can contact) affect market qualities differently. Contrasting SMS to bilateral bargaining (BB), the model shows that investors might favor BB over SMS if search intensity is high or in distress. Such preference for BB hurts allocative efficiency and suggests an intrinsic hindrance in the adoption of all-to-all and request-for-quote type of electronic trading in OTC markets.

Illiquidity and Higher Cumulants (with Semyon Malamud and Alberto Teguia),

Review of Financial Studies (2023), 36(5): 2131-2173

We characterize the unique equilibrium in an economy populated by strategic CARA investors who trade multiple risky assets with arbitrarily distributed payoffs. We use our explicit solution to study the joint behaviour of illiquidity of option contracts and show that, contrary to the conventional wisdom, option bid-ask spreads may decrease in risk aversion, physical variance, and open interest but increase after earnings announcements. All these predictions are confirmed empirically using a large panel dataset of US stock options.

When Large Traders Create Noise (with John Kuong),

Journal of Financial Economics (2023), 150(2): 103709

We consider a market where large investors do not only trade on information about asset fundamentals. When they trade more aggressively, the price becomes less informative. Other investors who learn from prices, in turn, are less concerned about adverse selection and provide more liquidity, causing large investors to trade even more aggressively. This trading complementarity can engender three unconventional results: i) increased competition among large investors makes all investors worse off, ii) more precise private information reduces price informativeness, creating complementarities in information acquisition, and iii) multiple equilibria emerge. Our results have implications for competition and transparency policies in financial markets.

Working Papers


(with Stathi Avdis)

We introduce CHILE, an asymmetric information asset-pricing framework with general utilities and payoffs. It features a large economy (LE) with continuous-and-heterogeneous information (CHI). We apply the framework to ask how wealth inequality affects market quality. Holding the quality of private information fixed, making the rich richer and the poor poorer harms information efficiency but improves liquidity. So does making the rich more informed and the poor less informed while holding wealth fixed. With endogenous information, the above effects are reinforced. Overall, widening wealth inequality is a double-edged sword for market quality, increasing liquidity but harming information efficiency.

Strategic Trading with Wealth Effects

(with Semyon Malamud and Alberto Teguia)

We analyze asset prices and liquidity in an economy with large investors and many risky assets. The model allows for general investors' preferences and distributions of asset payoffs. We propose a constructive solution approach: solving for equilibrium reduces to solving nonlinear first-order ODE. We show that the equilibrium is unique under mild restrictions on payoffs and preferences. Liquidity risk is priced in equilibrium, leading to deviations from the consumption-CAPM. In stark contrast to a constant absolute risk aversion (CARA) benchmark, in a model with wealth effects, we obtain (1) illiquidity of risk-free assets (such as, e.g., Treasuries); (2) illiquidity contagion (a sell-off in one asset may have a price impact on assets with unrelated fundamentals) and asymmetry in cross-asset price impacts; (3) market liquidity may decrease in the number of traders and their wealth; and (4) in the presence of liquidity shortage, price impact may become negative giving rise to an illiquidity premium in asset prices; (5) safe assets are more illiquid because they have a larger price impact. In the presence of wealth heterogeneity, large traders trade more but also reduce their demands more. As a group, they account for a smaller fraction of orders compared to small investors. Fatter-tailed wealth distribution makes markets less liquid.

Price Formation in the Foreign Exchange Market

(with Florent Gallien, Serge Kassibrakis, Semyon Malamud and Alberto Teguia)

We study joint price formation in the dealer-to-dealer (D2D) and dealer-to-customer (D2C) segments of the foreign exchange (FX) market, both theoretically and empirically. Our theory accounts for dealer heterogeneity, market power, and non-exclusive customer-dealer relationship and shows that several statistics of the cross-section of D2C quotes help predict D2D prices and liquidity. In particular, D2D prices are negatively related to cross-sectional covariance between D2C mid-quotes and spreads, contrary to predictions of other theories of two-tiered markets. Our predictions are confirmed empirically using unique proprietary D2C data. Model calibration reveals and quantifies the FX market’s inelasticity and non-competitiveness.

Inactive Working Papers

Asset Prices and Liquidity with Market Power and Non-Gaussian Payoffs (with Semyon Malamud and Alberto Teguia),

(Subsumed by "Illiquidity and Higher Cumulants")

Liquidity versus Information Efficiency

(Subsumed by "When Large Traders Create Noise")

Strategic Trading without Normality

(Subsumed by "Illiquidity and Higher Cumulants")

Capital Market Equilibrium with Competition Among Institutional Investors (with Dmitry Makarov)