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France’s sovereign credit rating is slipping, and the market expects higher borrowing costs. For quantitative traders, the ripple effects reach bond yields, currency spreads, and risk premia that underpin many systematic models. This article explains the mechanics, connects them to core finance concepts taught in elite quantitative programs, and offers concrete steps to adjust your models. Creditworthiness and Borrowing Costs When a country’s creditworthiness deteriorates, investors demand a higher yield to compensate for perceived risk. The yield spread over a benchmark (e.g., German Bunds) widens, directly raising the cost of sovereign debt....