He spent a bunch of weeks there, there are many good observations, here is one of them:
17. Big question: Why is Spain so much richer now than almost any country in Spanish America? Before you answer with great confidence, ponder this: According to Angus Maddison’s data on per-capita GDP in 1950, Spain was poorer than Argentina, Chile, Mexico, Peru, Uruguay, and Venezuela, and roughly equal to Colombia, Bolivia, Costa Rica, Cuba, Ecuador, Guatemala, and Panama. This is 11 years after the end of the Spanish Civil War, and Spain of course stayed out of World War II.
The worst grocery store I saw in Spain offered higher quality, more variety, and lower prices than the best grocery store I saw in Denmark, Sweden, or Norway.
Do read the whole thing.