Convergence / Divergence
When two central banks split, the cross between them rips
- Define monetary divergence and convergence between two CBs
- Identify which FX cross is most exposed to each
- Spot when a divergence trade is fully priced
EUR/USD doesn't move because of EUR or USD alone. It moves because of the *gap* between the ECB and the Fed. When their paths diverge — one hiking, one pausing — the cross moves dramatically. When they converge again, it grinds.
Divergence drives trends
Monetary divergence: two CBs taking different paths. Fed hiking, ECB pausing → USD strengthens vs EUR. The wider the divergence, the bigger the move. Divergence trades are where multi-month trends are born.
Convergence kills trends
Monetary convergence: two CBs moving in sync. Both hiking together → cross goes nowhere. Both cutting together → same. The relative pricing washes out. EUR/USD spent much of 2014-15 grinding while Fed + ECB moved in tandem-ish.
Fed pauses, BoE keeps hiking → buy GBP/USD. The rate gap widens, capital flows pick the higher-yield side. The cross rallies for weeks/months.
Both Fed + BoE cutting in tandem → GBP/USD grinds. The differential isn't changing meaningfully; the cross is a chop fest. Wait for a divergence to develop.
Fed: pricing 75bp of cuts over 12 months. ECB: pricing 25bp of cuts. What's likely true for EUR/USD?
- FX crosses move on the *gap* between two CBs
- Divergence (paths splitting) = trend trades
- Convergence (paths same) = chop
- Watch implied rate paths, not just spot rates
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