A new paper sheds light on what sustains growth. A very important issue for countries like Zambia which require sustained growth in order to meet the government's goal of "becoming a middle income country by 2030". Excerpt:
Our main findings confirm some previous results in the literature—in particular, that external shocks and macroeconomic volatility are negatively associated with the length of growth spells, and that good political institutions help prolong growth spells. We also have some more surprising findings. Trade liberalization, seems to help not only in getting growth going, as emphasized by previous authors, but also in sustaining it—particularly when combined with competitive exchange rates, current account surpluses, and an external capital structure weighted toward foreign domestic investment (see also Dell’Ariccia and others (2008) on this latter point). Furthermore, we find that export composition matters. Consistent with the findings of Johnson, Ostry, and Subramanian (2006, 2007), Hausmann, Hwang, and Rodrik (2006) and Hausmann, Rodriguez, and Wagner (2006), we find that the manufacturing share in exports, and more generally, export product sophistication tend to prolong growth. Most strikingly, we find that the duration of growth spells is strongly related to income distribution: more equal societies tend to grow longer.