Dynamic Volatility Spillovers Among G20 Economies During the Global Crisis Periods—A TVP VAR Analysis

Himanshu Goel, Parminder Bajaj, Monika Agarwal, Abdallah AlKhawaja and Suzan Dsouza ()
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Himanshu Goel: Management Department, Jagan Institute of Management Studies, Sector-5, Rohini, Delhi 110085, India
Parminder Bajaj: Management Department, Jagan Institute of Management Studies, Sector-5, Rohini, Delhi 110085, India
Monika Agarwal: Management Department, Jagan Institute of Management Studies, Sector-5, Rohini, Delhi 110085, India
Abdallah AlKhawaja: College of Business Administration, American University of the Middle East, Egaila P.O. Box 220, Kuwait
Suzan Dsouza: College of Business Administration, American University of the Middle East, Egaila P.O. Box 220, Kuwait

Econometrics, 2025, vol. 13, issue 4, 1-33

Abstract: Previous research on financial contagion has mostly looked at volatility spillovers using static or fixed parameter models. These models don’t always take into account how inter-market links change and depend on frequency during big crises. This study fills in that gap by looking at how changes in volatility in the G20 equity markets affected four big global events: the global financial crisis of 2008, the European debt crisis, the COVID-19 pandemic, and the Russia-Ukraine war. The study uses a Time-Varying Parameter Vector Autoregression (TVP VAR) framework along with the Baruník-Křehlík frequency domain spillover measure to look at how connectedness changes over short-term (1–5 days) and long-term (5–Inf days) time periods. The results show that systemic connectedness changes a lot during crises. For example, the Total Connectedness Index (TCI) was 24–25 percent during the GFC and EDC, 34 percent during COVID-19, and a huge jump to 60 percent during the Russia-Ukraine war. During the global financial crisis and the war between Russia and Ukraine, the US constantly emerged as the largest transmitter. During the European debt crisis, on the other hand, emerging markets like Turkey, South Africa, and Japan acted as net transmitters. During all crisis times, short-term spillovers are the most common. This shows how important high-frequency volatility transmission is. This study is different from others because it uses both time-varying and frequency domain views. This gives us a better idea of how crises change the way global finances are linked. The results are very important for policymakers and investors because they show how important it is to coordinate risk management, improve market safety, and make systemic stress testing better in a global financial world.

Keywords: volatility spillovers; G20 equity markets; TVP VAR BK model; global crisis; systematic risk (search for similar items in EconPapers)
JEL-codes: B23 C C00 C01 C1 C2 C3 C4 C5 C8 (search for similar items in EconPapers)
Date: 2025
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