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The NIFTY50 index slipped 5% after the release of the Q1FY27 GDP figures, a move that caught many market participants off guard. For quantitative traders, such a sharp reaction offers a natural laboratory to test the robustness of models, risk controls, and execution costs. This article walks through the analytical steps needed to assess the event, using concepts from a graduate‑level finance curriculum and a concrete worked example of edge versus cost. Interpreting the Macro Shock The GDP release signaled slower growth than consensus, prompting a reassessment of earnings expectations across the index....