“For a world in which international trade would be based only on the differences featured in the Heckscher-Ohlin theory, the shift from no trade to free trade is like a zero-sum game” (Pugel, 2015, p...

“For a world in which international trade would be based only on the differences featured in the Heckscher-Ohlin theory, the shift from no trade to free trade is like a zero-sum game” (Pugel, 2015, p 63) Need to compare this statement to at least 3 scholarly articles to determine if its validity