Samuel Kronen in Quillette:
Somewhere out of the mysterious interplay between nature and nurture, internal and external factors, cultures and structures, and bottom-up and top-down forces there emerge the individual and group outcomes that we care about and which ultimately make the difference between human flourishing and its absence. What distinguishes various political ideologies, in effect, is how the line of causation is drawn, or, more specifically, from which direction. What gets left unexamined in the rush for compelling narratives and ideological certainty, however, is the territory between different causes and how they combine to shape reality. Few have gone further to map that territory than the American economist, political philosopher, and public intellectual Thomas Sowell.
At 90 years of age, Sowell remains among the most prolific, influential, and penetrating minds of the past century. He understands the world in terms of trade-offs, incentives, constraints, systemic processes, feedback mechanisms, and human capital, an understanding developed by scrutinizing available data, considering human experience, and applying robust common sense.