Global Macro Strategies

Global macro is the oldest discretionary hedge-fund strategy and still the one with the widest canvas. A macro trader forms a view about something big — a central bank hikes more than priced, a currency peg cannot hold, an economy is slowing faster than consensus — then expresses it in whichever instrument gives the cleanest exposure to that specific view. The economics is the easy part; the craft is expression and sizing.

The instrument is half the trade

Suppose you believe the Bank of Japan will abandon yield-curve control. You could short JGB futures, pay fixed in a yen swap, buy yen against the dollar, buy a payer swaption, or short a rate-sensitive equity basket. Each has different Carry, different convexity, and a different way of being wrong while your thesis is right. Macro books live in the deepest instruments on the planet — bond and equity-index futures, FX forwards, swaps and swaptions, commodity futures — the only markets that let a large fund get in and out.

Where the edge comes from

Macro edge is not better GDP forecasting. It comes from three structural facts:

• Non-profit-maximising participants. Central banks defending pegs, treasuries issuing on a calendar, pensions hedging liabilities and index funds rolling futures all transact for reasons other than expected return. Someone must take the other side.
• Policy asymmetry. A committed policy — a band, a peg, a cap — truncates the distribution. While it holds, price barely moves; when it breaks, it moves a lot. That is a cheap option the policymaker has written to the market.
• Slow repricing of regimes. Markets price the level of policy quickly and the regime slowly. The 2021–22 inflation repricing took eighteen months — plenty of time to be right and still get paid.

A real trade: sterling, September 1992

The UK joined the ERM in 1990 at roughly DM 2.95 to the pound, with a floor near DM 2.778. Sterling was overvalued and Britain was in recession, so defending that floor meant painfully high rates. On 16 September 1992 the government took the base rate from 10% to 12%, announced a further move to 15%, and quit the mechanism that evening. Sterling fell roughly 15% against the mark over the following weeks; Soros's Quantum Fund, short a reported $10bn, made about $1bn.

The instructive part is the arithmetic. Shorting sterling meant paying the UK rate and receiving the German one — call it 1 percentage point of negative carry a year.

• Cost of waiting: $10bn × 1% ≈ $100m a year, about $8m a month.
• Downside if the peg held: sterling could not fall below the floor by definition, so the loss was bounded at the carry plus a small move inside the band.
• Payoff if it broke: 15% on $10bn ≈ $1.5bn.

A payoff near 15:1 with a known monthly bill for being early: you can be wrong on timing for a year and still make many times your losses. Macro traders hunt this shape.

Expressing convexity with options

Macro views are often "a big move, direction and timing uncertain", so they are frequently expressed in options: a fixed premium instead of open-ended risk. Drag the strikes below and watch the flat middle and the two rising wings — that flat region is what you pay for the right to be early.

Sizing a rates view

It is late 2022 and you think the Fed hikes 50bp more than the curve prices. Express it short 2-year Treasury futures: $200,000 face, roughly 1.9 years of duration, so DV01 — profit per basis point — is about

$\text{DV01} = 200{,}000 \times 1.9 \times 0.0001 \approx 38$

about $38 per contract per basis point. To make $1m if you are right by 50bp:

$N = \frac{1{,}000{,}000}{38 \times 50} \approx 526 \text{ contracts}$

That is $105m of face value, and margin is roughly $1,000 a contract — about $0.5m against a $100m fund. The position expressing your entire thesis barely registers on the balance sheet, which is why macro funds park cash in bills and why risk limits, not capital, bind.

What erodes the edge

Forward guidance killed much of it: when a central bank publishes its reaction function, the surprises macro feeds on shrink. Quantitative easing suppressed rate and FX volatility for most of 2012–2020 and macro returns went nearly flat — the strategy is implicitly long policy volatility. Crowding does the rest; when the same three trades sit in every macro book, the exit is narrow and stop-outs cascade. 2022 was the best macro year in decades precisely because policy turned uncertain again.

In interviews

Define macro as top-down views expressed in the most liquid instruments, then move straight to expression and carry. Sterling 1992 is the cleanest illustration: bounded downside because the band capped the move, ~15% upside on the break, a known monthly bill for waiting. Size a futures trade from DV01 and note that margin is trivial next to risk. Finish with the weakness — macro is long policy volatility, so it starves in guided, quiet regimes and feeds on dislocations.