Commodity Dependence and Trade Variables of Selected Sub-Saharan Countries

The study used annual balanced panel data from 2000 to 2020 that was obtained from world bank (World Development Indicators, 2022). These include: terms of trade (TOT), exchange rate (XRATE) and balance of trade (BOT), export value of the dependent commodity of country, total export value of country and trade openness. Data of control variables (gross capitation formation (GCF) and population growth (POPGT)) were also collected from WDI. Data for agricultural commodity prices, global oil prices (GOP) and mineral and metal ore prices are obtained from World Bank commodity price data portal. The commodity dependency index of country i at time i was computed as the as the ratio of export value of the dependent commodity to the total export value of the country. Due the challenge of obtaining the consistent data, 31 sub-Saharan countries were considered in the study. Specifically, 11 agricultural commodity dependent countries, 6 energy commodity dependent countries and 14 mineral and metal ore dependent countries were selected. Appendix Table 1 provide a list of these countries.

本研究采用了2000年至2020年的年度平衡面板数据，该数据源自世界银行的世界发展指标（2022年版）。数据内容包括：贸易条件（TOT）、汇率（XRATE）以及贸易顺差（BOT）、依赖国商品的出口价值、国家的总出口价值以及贸易开放度。控制变量（包括总资本形成（GCF）和人口增长率（POPGT））的数据亦从世界发展指标中收集。农产品价格、全球石油价格（GOP）以及矿产和金属矿石价格的数据则来源于世界银行商品价格数据门户。国家i在时间i的商品依赖指数被计算为依赖国商品出口价值与国家总出口价值的比率。鉴于获取一致数据的挑战，本研究选取了31个撒哈拉以南非洲国家。具体而言，包括11个农业商品依赖国、6个能源商品依赖国以及14个矿产和金属矿石依赖国。附录表1提供了这些国家的清单。