One important impact he had on my thinking is that he rejects groupings of people based on snapshots in time. For instance, it is very common to use income as a proxy for your economic success, and then to group people into quintiles, calling the bottom quintile "the poor". It seems reasonable, but it's wrong enough to lead to very wrong conclusions. A college student living on their own will appear to be a "poor hou…
He could learn a few things concerning human judgment and decision-making under uncertainty from Richard Thaler and Daniel Kahneman.
A few points...
+ Sowell never truly questions the data that's the foundation of his work. For Sowell, history and historical data as reported by "conquerors" is never to be questioned. Amos Tversky and Daniel Kahneman have famously proved how problematic this approach is.
+ Sowell refuses to address human decision-making, judgment and uncertainty. For him, power and violence do not matter. If the black family structure was better and enough for self-improvement post-slavery then why did millions of blacks flee the South before the enactment of massive liberal civil rights policies?
In Sowell's world, America was great from 1863-1930. A time of great uncertainty and white terrorism that resulted in the Great Migration.
Source: https://en.wikipedia.org/wiki/Great_Migration_%28African_Ame...