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China reported a net loss of 9.9 million jobs last year, the second‑worst annual decline on record and the worst three‑year stretch since 2022. For quantitative traders, such a macro shock reshapes expectations about growth, consumption, and risk premia across asset classes. This article examines how to translate the employment data into model inputs, reassess factor exposures, and adjust portfolio construction. Understanding the Macro Signal A contraction of nearly ten million jobs signals a sharp slowdown in domestic demand and a potential drag on corporate earnings. In a data‑driven framework, the first step is to quantify the shock relative to historical variance....