Sao Tome and Principe vs Zambia: Export product concentration index
Export product concentration index over time
- Sao Tome and Principe
- Zambia
How they compare
Zambia currently reports 0.6462 against 0.5858 in Sao Tome and Principe, a difference of 0.0604.
That makes Zambia's figure about 1.1 times Sao Tome and Principe's.
The two have swapped places 6 times across 17 shared years of data; in 1995 it was Zambia ahead.
Sao Tome and Principe ranks 14th and Zambia ranks 12th of 53 countries.
Across the 3 decades both report, Sao Tome and Principe averaged higher in 1 and Zambia in 2.
Head to head by decade
| Decade | Sao Tome and Principe | Zambia | Difference | Ahead |
|---|---|---|---|---|
| 1990s | 0.6467 | 0.5636 | 0.0831 | Sao Tome and Principe |
| 2000s | 0.4853 | 0.5495 | 0.0642 | Zambia |
| 2010s | 0.4888 | 0.672 | 0.1832 | Zambia |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher export product concentration index, Sao Tome and Principe or Zambia?
- Zambia, at 0.6462 against 0.5858 in Sao Tome and Principe as of 2011.
- What is the difference in export product concentration index between Sao Tome and Principe and Zambia?
- 0.0604, with Zambia ahead.
- How many years of comparable data are there for Sao Tome and Principe and Zambia?
- 17 years are reported by both, from 1995 to 2011.
- How do Sao Tome and Principe and Zambia rank globally for export product concentration index?
- Sao Tome and Principe ranks 14th and Zambia ranks 12th of 53 countries.
- Where does this data come from?
- UNCTAD Statistical Office, also reported in the UNCTAD Handbook of Statistics, various issues (http://unctadstat.unctad.org/), published as Export product concentration index. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
This indicator reflects the Herfindahl-Hirschmann index measure of the degree of export concentration within a country. The sectoral Hirschmann index is defined as the square root of the sum of the squared shares of exports of each industry in total exports for the region under study. Takes a value between 0 and 1, with 1 indicating that only a single product is exported. Higher values indicate that exports are concentrated in fewer sectors. On the contrary, values closer to 0 reflect a more equal distribution of market shares among exporters. Note that this type of concentration indicator tends to be quite vulnerable to cyclical fluctuations in relative-prices, in a way that commodity price rises make commodity exporters look more concentrated.