About
Author bio, methodology, external profiles, full publications list with DOIs, references, and a contact form for collaboration enquiries.
Bio
Assistant Professor in Finance, Department of Finance, Kozminski University, Warsaw. Research Assistant at FAME|GRAPE since 2019. Twenty-plus years of fixed-income practitioner experience as senior analyst, portfolio manager, and risk manager before entering academia.
MSc in Mathematical Finance, University of Oxford.
External profiles & media
Selected publications & working papers
- Welfare Measurements with Heterogeneous Agents doi:10.2139/ssrn.5335293 A unified welfare-measurement framework for heterogeneous-agent economies. Builds on Weretka's pivotal-agent welfare formula and extends it to environments with idiosyncratic shocks and incomplete markets, with closed-form expressions for compensating and equivalent variations under standard preference parameterisations. Calibrated to Polish household survey data.
- Closer to New York than to Frankfurt? The Expectations Hypothesis in Poland, the US and the Euro Area doi:10.2139/ssrn.6695444 Five families of expectations-hypothesis tests applied to Polish, US and euro-area sovereign curves over 2005-2026. The Polish curve is mildly anti-PEH, the US is roughly consistent with PEH at long horizons, and the euro-area AAA panel rejects strongly under asymptotic Newey-West but barely under wild block bootstrap — clean evidence for the Bauer-Hamilton (2018) concern about asymptotic inference in overlapping-return regressions with persistent regressors.
- Are Survey-Based Rate Expectations Informative? Evidence from Less-Liquid Markets doi:10.2139/ssrn.6644222 Tests whether the NBP Survey of Professional Forecasters carries information beyond what is already in the Polish term structure. Uses ACM and BRW expected-rate paths from the LW-NSS-fitted Polish zero-coupon panel as the model benchmark, runs Diebold-Mariano, Clark-West and forecast-encompassing tests at horizons of 1 to 60 months. The model wins at 3y and 5y, the survey wins at 1y; encompassing tests reject the survey at long horizons.
- Parsimonious Yield Curve Modeling in Less-Liquid Markets FAME|GRAPE working papers Develops the liquidity-weighted Nelson-Siegel-Svensson (LW-NSS) framework for sovereign curves where bond-by-bond observation noise is heterogeneous. Information-matrix derivation gives an explicit weight-matrix structure derived from BondSpot turnover and outstanding amounts. Refit of the Polish panel reduces 21-year mean fit MAE by 1.6 bp versus equal-weight NSS while preserving curvature.
- When 3% Means Nothing: Calibrating Escalation Limits to a Bank's Own Forecasting Error Distribution doi:10.2139/ssrn.6276722 Argues that bank-internal escalation thresholds for forecasting errors should be calibrated to the empirical error distribution of the institution rather than imposed as round-number percentages. Develops the calibration on Polish bank stress-test data and shows that uniform 3% thresholds either grossly under- or over-trigger depending on the size and macroeconomic exposure of the institution.
- From Point through Density Valuation to Individual Risk Assessment in the Discounted Cash Flows Method doi:10.1002/ijfe.2084 Reformulates the discounted-cash-flow valuation method to deliver a full distribution of valuation outcomes rather than a point estimate, with explicit treatment of cash-flow uncertainty and discount-rate uncertainty. Shows how the resulting distribution feeds directly into individual position-level risk assessment.
- Markovian and Multi-Curve Friendly Parametrisation of a HJM Model Used in Valuation Adjustment of Interest Rate Derivatives PDF — bankikredyt.nbp.pl Derives a Markovian, multi-curve-consistent parametrisation of the Heath-Jarrow-Morton model suitable for XVA computation across collateralised and uncollateralised interest-rate derivatives. Reduces the dimensionality of the state vector required for valuation adjustment without sacrificing fit on the swap-curve and OIS-curve data.
For the full publication list and ongoing working papers see the GRAPE, SSRN and RePEc profiles linked above.
Data sources
Polish bond panel: BondSpot venue closing fixings (price, bid, ask, turnover) — aggregated from Polish Ministry of Finance disclosures.
Outstanding amounts and turnover weights: Polish Min-Fin monthly statistics; pre-2014 panel reconstructed from KDPW MD pivots.
Short-end anchor: NBP money-market bill rate.
NBP Survey of Professional Forecasters: 57 quarterly survey releases, implied short-rate path constructed per the methodology in Dec (2026, SSRN 6644222).
US Treasury zeros: Gürkaynak-Sack-Wright (GSW) updated panel.
Euro-area zeros: ECB AAA spot-rate database.
Macro panel: CPI, registered unemployment, FX volatility, NBP rate changes — Polish Statistical Office and NBP.
References
A combined bibliography drawn from the four working papers behind the dashboards. Click any DOI to retrieve the source.
Contact & collaboration
Use the form below for collaboration enquiries — especially if you are working on less-liquid sovereign bond markets in Central and Eastern Europe, Latin America, South Africa, the Philippines, India, or any other emerging market where the LW-NSS framework would be useful. The "what brought you here" dropdown helps me prioritise replies.
Direct email: [email protected]