The theory suggesting that the patterns of international trade are determined by factor endowment rather than productivity was propounded by which one of the following?

The theory suggesting that the patterns of international trade are determined by factor endowment rather than productivity was propounded by which one of the following? Correct Answer Heckscher and Bertil Ohlin

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The question given below consists of a statement, followed by three arguments numbered I, II and III. You have to decide which of the arguments is/are ‘strong' arguments and which is/are ‘weak' arguments and accordingly choose your answer from the alternatives given below each question. Statement: The United States has launched what China calls the ‘largest trade war in economic history' and in its latest move targeted another $200 billion in Chinese export goods. The US-China spat is one of several trade fights picked by the protectionist President Donald Trump as his ‘America First' agenda disrupts trade relations among traditional allies. The growing share of international trade under threat has raised the prospect the escalating trade war could harm the global economy, shrinking investments and undermining supply chains. Why? Arguments: I. Several companies - including Total and Peugeot of France, and Russia's Lukoil - have said they are preparing to exit Iran ahead of US deadlines, the last of which is November 4. II. Trump argued the original deal from 2012 was lopsided in Seoul's favour but has also clouded the issue by appearing to link trade concessions to progress in his separate track of talks with nuclear-armed North Korea. III. Meanwhile, talks among the three NAFTA (North American Free Trade Agreement) signatories, launched after Trump demanded an overhaul of the ‘terrible deal', have snagged notably owing to the US demands to increase American content installed in duty-free autos. 
Factor endowment theory of international trade was propounded by