A spillover effect — also referred to as an externality or contagion in financial contexts — refers to the economic or financial impact that an event, policy, or decision in one market, sector, country, or asset class has on another that is not directly party to that event, extending beyond the originally affected area through interconnectedness. Positive spillovers occur when the benefits of a development spread beyond its direct participants — such as infrastructure investment in one region stimulating economic activity in surrounding areas. Negative spillovers — often called contagion — occur when financial distress in one market or institution spreads to others, as seen during the 2008 global financial crisis, the 2018 IL&FS crisis in India, or the 2023 US regional banking turmoil. For macroeconomic analysts and investors on Ventura Securities, identifying and assessing spillover effects is critical for understanding cross-asset correlations, sectoral interdependencies, and the systemic risk implications of major economic or financial events — essential inputs for portfolio stress testing and risk-adjusted asset allocation decisions.
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