Lesson 5 of 9 · 7 min
GDP and the growth cycle
Economies move in cycles, central banks respond to them, and currencies follow. Learn where in the cycle to look.
By the end you'll be able to
- Explain what GDP measures and why it moves markets less than you might expect
- Describe the four phases of the economic cycle and what central banks do in each
- Relate a country's position in the cycle to the likely direction of its currency
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GDP is the biggest number in economics and one of the least useful on release day. Its real value is in telling you where an economy sits in its cycle, and that tells you where rates are going.
What GDP is
GDP is the total value of everything an economy produces in a period. Markets watch its growth rate, usually quarterly. Strong growth supports a currency through the familiar chain: more investment, more inflation pressure, higher rates.
The catch is timing. GDP is published weeks after the quarter ends, is revised twice, and most of its content is already visible in the monthly jobs, sales and survey data. By release day, the market has usually guessed it closely. Big surprises are rare and moves are modest compared with CPI or NFP.
The cycle
Hiring is strong, spending rises and inflation starts to pick up. The central bank begins raising rates to keep it in check.
Currency: Usually strengthens: rising rates attract capital and growth attracts investment.
Tap a phase of the cycle. Currencies tend to follow interest-rate expectations through it.
Economies move through recovery, expansion, peak and slowdown, and central banks respond at each stage. Because currencies follow rate expectations, they follow the cycle too, usually ahead of it: the market starts pricing the next phase before it arrives.
For a pair, compare where each of the two economies sits in the cycle. A country raising rates against one that is cutting produces the clearest trends in forex.
Try it
| Time | Cur. | Impact | Event | Previous | Forecast | Actual |
|---|---|---|---|---|---|---|
| 13:30 | USD | ●●● | GDP growth (quarterly, annualised) | 2.1% | 2.4% | — |
Slide the actual figure. The market reacts to the gap between actual and forecast, not to the number itself. Reactions are illustrative.
Notice how even a large GDP surprise produces a smaller modelled reaction than the CPI example in lesson 3. The impact rating on the calendar reflects this.
Quick check
Question 1 of 3
Why does GDP often move markets less than CPI?
Question 2 of 3
In which phase of the cycle is a central bank most likely to be raising rates?
Question 3 of 3
Country A is raising rates; country B is cutting. The pair A/B is likely to:
Go deeper: GDP and Forex: Why Growth Data Moves Less Than You Think