Career
Beginning in the 1950s, Inada wrote a number of important papers on welfare economics, economic growth and international trade. His contributions include an early extension of Kenneth Arrow"s impossibility theorem on the existence of a social welfare function (1955). Inada"s extension of the Stolper–Samuelson theorem to the many-good, many-factor case is also considered as a classic piece in trade theory (1971).
He is known for the Inada conditions on a production function that can guarantee the stability of an economic growth path in a neoclassical growth model.