" Many rubber estates kept records of the daily output of each tapper, and distinguished between the output of Chinese and Indian workers. The output of the Chinese was usually more than double that of the Indians, with all of them using the same simple equipment of tapping knife, latex cup and latex bucket. There were similar or even wider differences between Chinese, Indian and Malay smallholders. . "

― Thomas Sowell , Wealth, Poverty and Politics: An International Perspective