Reading the national accounts of a service-based island economy

A single growth figure tells you very little about an economy of this size. What matters is the composition underneath it, because a handful of sectors carry most of the weight and they do not move together.

What the structure looks like

The economy is service-dominated, as most small island economies are. Within services, several distinct activities matter:

• Tourism and related activity — accommodation, food services, transport, retail
• Education services — including an international university presence, which generates substantial local spending
• Government services, a significant employer in any small state
• Financial and business services

Outside services:

• Agriculture — spice and cocoa crops with export significance beyond their share of output
• Construction, which is volatile and project-driven
• Manufacturing, small in scale

The important reading point: agriculture's contribution to output understates its importance, because it supports rural employment, export earnings and national identity in ways a share of GDP does not capture.

Why the sectors move separately

Each responds to a different driver, which is why an aggregate figure can conceal a great deal:

• Tourism — external demand, airlift capacity, conditions in source markets
• Education services — enrolment cycles, which are relatively stable
• Construction — individual projects and public capital spending
• Agriculture — weather, world commodity prices, crop cycles

The practical consequence: a flat headline can contain a strong tourism year offset by a weak construction year, and treating the aggregate as the story misses everything that actually happened.

The relative stability of the education sector is worth noting as a structural point. A resident student population spends locally regardless of the tourism season, which smooths part of the year in a way pure tourism economies do not experience.

Seasonality

Quarterly figures are strongly seasonal, and comparing adjacent quarters without adjustment is a common error.

• Tourism has a defined season, which dominates quarterly patterns
• Agriculture follows crop cycles
• Festival periods concentrate activity
• Construction responds to weather and to the fiscal year

The rule that follows: compare like quarters year on year, not adjacent quarters, unless the series is explicitly seasonally adjusted.

What to look at instead of the headline

1. Sector composition and how it has shifted
2. Multi-year averages rather than single years
3. Contribution to growth by sector, which shows what actually drove a number
4. Employment by sector, which often tells a different story from output
5. The external accounts, given how open the economy is
6. Whether a large one-off project is present in the period

Point three is the most informative single view. Contribution-to-growth decomposition shows whether a growth figure came from one sector or from broad improvement, and those are very different economic conditions behind the same number.

Common misreadings

• Treating a single year as a trend in a volatile small economy
• Comparing quarters without seasonal adjustment
• Assuming a sector's output share equals its importance
• Reading a construction-driven year as broad-based growth
• Ignoring revisions, which can be material
• Comparing with large economies rather than with peers

The fourth is the most consequential for policy discussion. Growth driven by a single large construction project is real but temporary, and a projection extending it forward will be wrong in a predictable direction.

Frequently asked questions