You can blame it in part on the rise in U.S. interest rates and the slowdown in China’s growth
In 1988, MSCI launched the Emerging Markets Index, which consisted of just 10 countries representing less than 1% of world market capitalization. Today the MSCI Emerging Markets Index consists of 24 countries representing 10% of world market capitalization. The Index is available for a number of regions, market segments/sizes and covers approximately 85% of the free float-adjusted market capitalization in each of the 24 countries.
https://www.msci.com/emerging-markets
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