This paper explores the evolution of OECD imports over time, measuring their concentration across origin countries at the product level. The authors find evidence of diversification followed, in the very last years of the sample period (post-2000), by a slight re-concentration. This...

This paper surveys the empirical literature on export and import diversification and its linkages with growth. We review widely-used measures of diversification and the evidence about their evolution focusing on how export diversification relates to trade liberalization and economic development....