Although most articles on the topic have depicted the prisoners as hardened criminals, Gutmann interviewed an Uighur policeman who told him that organs were harvested from young men arrested in political demonstrations. In the late 1990s, a young Uighur doctor was told “harvesting political prisoners was normal. A growing export. High volume. The military hospitals are leading the way.”
https://www.mercatornet.com/careful/articles/10051/
What does the sentence in red mean?
AHD "volume", def. a. " Volume in this context is the amount of business done, number of items sold, number of customers served, etc.
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AHD "volume", def. 4.a. "Amount; quantity: a low volume of business; a considerable volume of lumber."
Volume in this context is the amount of business done, number of items sold, number of customers served, etc. High volume is a lot of business, in this case a large number of organs were harvested and sold continually.