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John Cochrane commented on the similarity between FTPL and influential macroeconomic theories such as those by Keynes, Friedman and Schwartz, Lucas, and Woodford. Cochrane pointed out that just as these theories face doubts and lack strict causal tests, FTPL's achievements should be viewed in the same context.
The tweet suggests a balance between acknowledgment of FTPL's success and recognition of ongoing skepticism inherent to macroeconomic research.
Cochrane’s perspective on the challenges of validating macroeconomic theories is further informed by the broader historical context of economic performance, as reflected in the remarkable tenfold increase in U.S. GDP per capita over the past century. This trajectory, detailed in the analysis of GDP growth comparison debates, underscores both the progress and uncertainties that continue to shape economic thought.