Noah Smith tackles a provocative claim from economist Jesús Fernández-Villaverde: that the field of development economics has abandoned the "big questions" of why some nations industrialize and others stagnate. Smith doesn't just summarize the critique; he dismantles the assumption that the academic community is ignoring the macro-level drivers of wealth, arguing instead that the discipline is bogged down by the inherent difficulty of proving historical causality. For a listener trying to understand why global inequality persists despite decades of research, this piece offers a necessary reality check on the limits of economic science.
The "Acne vs. Aging" Dilemma
Smith begins by contextualizing the frustration. He notes that Jesús Fernández-Villaverde (JFV) argues the profession has "misallocated its own intellectual capital on a pretty heroic scale" by focusing on small-scale randomized controlled trials rather than the grand puzzle of industrialization. Smith acknowledges the emotional weight of this critique. It is easy to feel that studying microfinance impact evaluations is trivial when the world is starving for answers on why South Korea succeeded while Bolivia failed.
However, Smith pushes back with a compelling analogy. He suggests that demanding economists solve the mystery of national growth is like yelling at doctors to stop treating acne and only work on curing aging. "It doesn't make a lot of sense to yell at doctors to all stop studying acne and only work on aging," Smith writes, noting that while aging is the bigger problem, acne is what is actually solvable with current tools. This framing is effective because it shifts the blame from the researchers' choices to the limitations of their methodology.
"People keep saying that the recent Nobelists 'studied global poverty.' This is exactly wrong. They made a commitment to [the RCT] method, not a subject, and their commitment to [that] method prevented them from studying global poverty."
Smith cites Lant Pritchett to reinforce this point, highlighting that poverty programs account for less than 1 percent of the variation in poverty. The real driver, as Smith emphasizes, is economic growth, which cannot be studied through a randomized trial. "You can't do an RCT to study economic growth," he writes. This is a crucial distinction for the listener to grasp: the tools that work for evaluating a specific school lunch program are useless for explaining the rise of an industrial superpower.
Critics might argue that this defense lets the field off the hook too easily, suggesting that the "acne" of micro-interventions is merely a safe harbor for avoiding political risk. Yet, Smith's data suggests the problem isn't a lack of interest in big ideas, but a lack of consensus on how to test them.
The Tower of Babel in Development Theory
The core of Smith's argument is that the "big ideas" are not missing; they are abundant, contradictory, and fiercely defended. He lists a dizzying array of theories: institutions, geography, human capital, industrialism, culture, and state capacity. Each has a Nobel laureate or a blockbuster book attached to it. "There are plenty of high-profile academic papers laying out variants of each one of these theories," Smith notes, pointing out that the field is actually crowded, not empty.
He challenges the notion that the field has "given up" on these questions. "I'm not sure what 'field' JFV is referring to when he says 'The current field has largely given up' on the question of comparative development," Smith writes. He points out that even within development economics, only about 19% of papers use randomized controlled trials, meaning the vast majority of research is already grappling with broader structural issues.
"Basically, lots of development economists run cross-country regressions, and they always lead to vigorous arguments about what the regressions mean and whether the models were appropriate."
Smith uses the example of South Korea versus Bolivia to illustrate why these theories remain unresolved. The divergence between the two nations is "startling," yet the differences are so multifaceted—education, geography, ethnic homogeneity, military threats, and trade relationships—that isolating a single cause is nearly impossible. He draws a parallel to the historical context of import substitution industrialization, noting that while South Korea's export-led model succeeded, the "flying geese" theory of sequential growth also played a role, making a clean scientific verdict elusive.
"Depending on which Big Theory you believe, you could attribute Korea's relative success to any combination of these natural advantages and policy choices."
This is the piece's most insightful moment. Smith admits that while we can tell a good story about Poland's or Korea's success, "it's not a scientific explanation." The inability to run a controlled experiment on a nation means that every theory can be defended with a different set of historical anecdotes. This isn't a failure of effort; it's a failure of the scientific method when applied to unique historical events.
The Limits of Structural Models
Smith concludes by addressing the alternative to RCTs: structural models. He describes them as "toothbrushes"—everyone has one, but no one wants to use anyone else's. This metaphor perfectly captures the fragmentation of the field. Because there is no agreed-upon "correct" model for how economies grow, researchers retreat into their own silos, each building a complex theoretical framework that only they can fully trust.
"There are a va[riety of] structural models... but this approach has even more problems."
The implication is stark: until economists can agree on a methodology that rivals the rigor of an RCT but applies to macro-level history, the "big questions" will remain a matter of ideology and storytelling rather than settled science. Smith suggests that the frustration JFV feels is real, but the diagnosis is wrong. The field isn't ignoring the big questions; it's simply hitting a wall of complexity that no amount of data can currently clear.
"So I'm not sure what JFV is talking about here. He's an economist I like and respect, but his perception of the state of research on the big questions of development doesn't seem very accurate."
Bottom Line
Smith's strongest move is reframing the debate from "neglect" to "methodological impossibility," forcing the listener to confront the limits of what economics can actually prove about national destiny. The argument's vulnerability lies in its potential to excuse a lack of progress; just because a problem is hard doesn't mean the field shouldn't try harder to bridge the gap between micro-evidence and macro-theory. Readers should watch for how the next generation of economists attempts to merge these disparate theories into a unified framework, rather than continuing to fight over which single theory holds the key.