Global Macro

A global macro manager starts with a thesis about the macro environment — for example, 'the Fed will cut rates faster than the market expects' or 'the yen is overvalued and will weaken against the dollar.' They then choose the instrument with the highest convexity and lowest cost to express it: buying Treasury futures and receiving on interest-rate swaps for a rates view, or shorting USD/JPY for an FX view. Positions are typically highly liquid and heavily levered, because individual macro moves are small in percentage terms (a currency moving 5% is a big move), so leverage of 5–20x notional is common. Macro funds split into discretionary (a portfolio manager makes judgment calls, e.g. Bridgewater's pure alpha, Brevan Howard) and systematic/quantitative (rules-based models trade trends and carry, e.g. CTAs like Winton or Man AHL).

Most macro P&L comes from three buckets. Directional trades bet outright on a market's level — long oil, short the 10-year Treasury. Relative-value (or spread) trades bet on the difference between two instruments while hedging out the overall market — e.g. long German Bunds vs. short US Treasuries to bet on diverging central banks, which isolates the spread and reduces exposure to a global rate shock. Carry trades harvest the yield differential between two assets — borrowing in a low-yielding currency (yen) to invest in a high-yielding one (Brazilian real), earning the spread as long as the FX rate is stable. Carry is profitable in calm markets but blows up violently in crises, the classic 'picking up nickels in front of a steamroller.'

The defining trade is George Soros and Stanley Druckenmiller 'breaking the Bank of England' in 1992: betting that the UK could not hold the pound's peg within the European Exchange Rate Mechanism, they shorted ~$10B of sterling, the BoE was forced to devalue, and the Quantum Fund made roughly $1B in a day. Other examples: John Paulson and others shorting US subprime mortgages via credit default swaps in 2007–08; and the post-COVID 2022 trade of shorting bonds ahead of the fastest Fed hiking cycle in 40 years. These show the pattern — a large, identifiable policy or imbalance, expressed with asymmetric, levered instruments.

Global macro is notoriously difficult because being right on the thesis is not enough — timing and sizing dominate returns. Keynes' line 'markets can stay irrational longer than you can stay solvent' is the macro trader's nightmare: a correct view that arrives 18 months late can still trigger margin calls and force liquidation. Because positions are levered and correlated to liquidity, macro funds use strict stop-losses, VaR limits, and scenario analysis. Returns are also lumpy and uncorrelated to equities, which is exactly why pensions and endowments allocate to macro as portfolio diversification — it tends to perform in the crises when long-short equity and credit do poorly.