“…in four countries: USA, the largest free-market economy in modern times, and three of the main European technologically leading countries since the industrial revolution, UK, Germany and France. Second, based on theoretical analyses (Mensch, 1975;Olsson, 2000Olsson, , 2001Olsson, , 2005Romer, 1990;Schumpeter, 1939;Zarotiadis & Ozouni, 2017) that stress applied knowledge as a significant driving force, we apply cross-spectral methodology to test its dynamic interrelationship with the economic performance of the above countries.…”