It is China. According to the data in the IMF’s World Economic Outlook, India’s real GDP has the most correlation with the China’s at 0.66. And no other country has this level of correlation with China.
Argentina has 0.56, Colombia 0.53 and Brazil 0.51. Indonesia’s correlation is just 0.27.
In comparison with China, India’s correlations with the US and Euro Area are just 0.27 and 0.42.
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