https://www.ucpress.edu/flyer/books/encyclopedia-of-theoretical-ecology/hardcover
Encyclopedia of Theoretical Ecology by Alan Hastings, Louis Gross - Hardcover
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https://www.stlouisfed.org/on-the-economy/2019/april/value-added-trade-measure
Value-Added vs. Gross Trade Flows | St. Louis Fed
With increasingly complicated global supply chains, tracking only gross trade flows is no longer sufficient.
value addedtrade flowsst louisvsgross