The United States and China, respectively, had 19.6% and 21.3% of the world's R&D scientists in 2013. Why then did the United States have 33.5% of the world's "effective" R&D scientists and China have 8.1% of the world's "effective" R&D scientists in 2013?

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The Answer of The United States and China, respectively, had 19.6% and 21.3% of the world's R&D scientists in 2013. Why then did the United States have 33.5% of the world's "effective" R&D scientists and China have 8.1% of the world's "effective" R&D scientists in 2013?

The United States and China, Respectively, Had 19