He was noted for his criticism of Japan's expansionist policies. As a result, Yanaihara was forced to resign from teaching under pressure by right-wing scholars in 1937. Yanaihara resumed his teaching after the war and taught international economics at the University of Tokyo.
Yanaihara was known for criticizing Japan's expansionary strategies. As a result, he was compelled to leave his teaching position due to pressure from right-wing scholars in 1937. Yanaihara returned to teaching after World War II and taught international economics at the University of Tokyo.