Abstract
We examine the impact of natural resource rents on diversification in exports, in employment and in value added, covering up to 136 countries from 1962 to 2012. We find a significant negative relationship between resource rents and diversification. The results are heterogeneous across different country groups and resources; the countries of the Arab Gulf are not an exception as they follow the high resource-dependent group. Moreover, we find that the higher the resource dependency, the less likely the country would go into diversification through its development, compared to less resource-dependent countries. Instead, concentration grows rapidly. These results are useful to policymakers in resource-rich countries who should be aware of how their economy is likely to be affected by resource rents.
Notes
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Azevedo, João Pedro (2007) AINEQUAL: Stata module to compute measures of inequality .
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Appendix: Data and Additional Tables and Figures
Appendix: Data and Additional Tables and Figures
Employment Data
Sectoral employment data are from the International Labor Office and United Nations Industrial Development Organization (UNIDO 2012). ILO data covers 127 countries, while UNIDO covers 125 countries. The ILO data includes all economic activities at the 1-digit level between 1969 and 2008. Sectoral shares are in percentages. The unbalanced panel has 2369 observations (country-year). The ILO dataset reports employment in different classifications: some countries use the ISIC revision 2, others moved to ISIC revisions 3 and 4 in recent years, and some are using their own national classification. Employment data in the more disaggregated ISICrev3 and ISICrev4 were aggregated to ISICrev2, following Imbs and Wacziarg (2003), Timmer and Vries (2007) and McMillan and Rodrik (2011). If a country reports two revisions, the lower one is used. Official estimates are preferred over labor surveys. Data not following ISIC conventions are dropped. Table 2.1 shows the concordance between ISICrev3 and ISICrev2.
ILO data sometimes have sudden big changes in numbers in certain sectors, as countries sometimes change their calculation methods even if the same classification/revision is used. This is taken into consideration in this study, by dropping the observations that report these sudden changes making the panel more harmonized.
Our alternative data source is UNIDO, which covers manufacturing activities only at the 3-digit level of disaggregation (the main 23 industrial sectors) between 1963 and 2010 (INDSTAT2). (INDSTAT4 disaggregates to 4-digit level but only goes back to 1985.) The UNIDO dataset is consistent over the years and did not need adjustment. The unbalanced panel has 3564 employment observations (country-year).
Value Added and Labor Productivity
The UNIDO dataset also provides information on value added per sector, offering an additional measure of sector size and productivity in industrial employment. The value-added dataset covers almost the same period as the employment dataset, although some countries do not report the two sets equally. The unbalanced panel has 3465 value added observations (country-year).
Exports Data
Exports data are from the World Integrated Trade Solution (WITS), which is a collaboration between the World Bank and the United Nations Conference of Trade and Development. The export data covers 133 countries. Data is selected in SITC 1-digit aggregation containing the main ten trade sectors. Values are reported in constant US$1000 with base year 2000. The unbalanced panel has 4575 observations (country-year). The WITS data values are consistent over the years and did not need any adjustment.
Diversification Indicators
Computing of these measures is done through Stata.Footnote 1
We calculate diversity for all sectors and for all non-resource sectors. Specifically, in the ILO data, we exclude “mining and quarrying”, and in the WITS exports data, we exclude “crude material, inedible, except fuels”, “mineral fuels, lubricants and related materials” and “commodities not classified according to kind”. The UNIDO data does not cover resource sectors at all.
Table 2.3 shows summary statistics for the diversification measures used in this study. Table 2.4 reports correlation between these measures, which is high. Figure 2.4 shows the historical performance of the diversification using the Gini index in all sectors examined.
Natural Resources Data
Several natural resources are used in this study: oil, gas, nickel, tin, copper, gold, iron, forest, coal, bauxite, silver, lead and phosphate. Resource rents are from the World Bank Wealth of Nations dataset and cover the period 1970–2008. Aggregate resource rent is calculated as the sum of all reported resources. The World Bank calculates resource rents as: Rents = Unit rent × production
Unit rent = unit price − unit cost
All rents are reported in current US dollars.
The measure for resource rents used in this study is the log of resource rents per capita. Resource rents are available for a wide panel of countries for a long period of time, allowing testing long-term effects on diversification and minimizing the risk of sample selection bias. Normalization by population size, taken from the Penn World Tables, avoids a bias toward large countries. Several resources are aggregated, using data constructed using the same methodology, allowing us to examine the effect of different resource rents on diversification at the same time. This measure has been used by several recent studies (Ross 2006; Bhattacharyya and Collier 2011).
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Alsharif, N.N. (2018). Natural Resources and Economic Diversification: Evidence from the GCC Countries. In: Mishrif, A., Al Balushi, Y. (eds) Economic Diversification in the Gulf Region, Volume II. The Political Economy of the Middle East. Palgrave Macmillan, Singapore. https://doi.org/10.1007/978-981-10-5786-1_2
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