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In page Prebisch–Singer hypothesis:

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Therefore, the statistical argument about the long-term trend in terms of trade of underdeveloped countries must be attributed to Singer. However, both seem to have independently invented similar explanations, stressing that the terms of trade moved against the 'borrowing' (i.e., underdeveloped) and in favour of the 'investing' (i.e., developed) countries. However, Prebisch specifically deals with the economic cycle and highlights to a greater extent than Singer the reasons for the different behaviour of wages in developed and underdeveloped countries, and received much greater recognition for his work, in part because of efforts by industrialized countries like the United States to distance themselves from his work.