GMAT Verbal Reasoning

For decades, economists treated differences in firm productivity as largely a function of capital intensity and workforce skill, assuming that managerial competence diffused freely across an industry once a superior method had been demonstrated. Recent large-scale surveys of manufacturing plants in a dozen countries complicate this assumption. The data reveal a persistent dispersion in management quality—measured through structured interviews assessing target-setting, monitoring, and incentive design—not only between countries but among plants within the same country, industry, and even ownership group.

What sustains this dispersion? One explanation emphasizes informational frictions: managers frequently overrate their own practices, and absent precise external benchmarks they perceive no reason to change. When researchers provided a randomized subset of textile firms with free consulting that diagnosed specific weaknesses, the adopting plants raised output without proportionate increases in inputs, and the gains persisted for years. That persistence is itself informative; had the relevant knowledge been genuinely free, competitors would presumably have closed the gap unaided.

A second explanation locates the friction in the labor market rather than the information environment. Well-managed firms tend to delegate authority, which is valuable only when middle managers can be trusted and monitored. Where the supply of educated managers is thin, or where weak contract enforcement makes owners reluctant to cede control to non-family members, even a firm that recognizes the value of delegation may rationally decline to adopt it. On this account, poor management is less a mistake than an adaptation to a constraining environment.

The two explanations carry different policy implications. If informational frictions dominate, the diffusion of benchmarking data and consulting could yield large returns. If the binding constraints are instead institutional, such interventions would produce only transient effects, and durable improvement would require changes to the surrounding market for managerial talent and the legal infrastructure that governs it.

Microscopic marine algae, or phytoplankton, draw carbon dioxide from surface waters during photosynthesis; when they die, a fraction of their carbon-rich remains sinks into the deep ocean, where it can stay sequestered for centuries. This “biological pump” is constrained in large regions of the ocean not by sunlight or by the major nutrients nitrogen and phosphorus, which are abundant there, but by the scarcity of iron, a micronutrient essential to photosynthesis. The observation prompted a provocative proposal: seeding such waters with soluble iron might trigger vast plankton blooms that would draw down atmospheric carbon and counteract warming.

Early small-scale experiments confirmed that added iron does induce blooms. Yet inducing a bloom is not the same as sequestering carbon. For the scheme to work, the carbon fixed at the surface must actually sink and remain isolated from the atmosphere; if the bloom is instead consumed by grazers near the surface, or if the sinking organic matter is respired back into carbon dioxide in shallow water, little net sequestration occurs. Measuring the fraction that reaches the deep ocean has proven far harder than measuring the bloom itself, and the few experiments designed to track export have yielded modest and variable results.

Critics raise a further concern. Large blooms can deplete the very nutrients that downstream ecosystems depend upon, and their decay can create oxygen-poor zones hostile to marine life. Proponents counter that these effects, while real, may be acceptable if the climatic benefit is large and if seeding is confined to regions where ecological disruption is minimal. The dispute, however, cannot be settled by appeals to plausibility; it turns on quantities—how much carbon is durably exported per unit of iron added—that remain poorly constrained by the available evidence.

Historians long portrayed the craft guilds of medieval and early modern Europe as obstacles to economic growth: monopolistic associations that suppressed competition, restricted entry, and resisted technological change in order to protect their members' incomes. On this view, the gradual erosion of guild privileges was a precondition for the industrial expansion that followed. Recent scholarship has complicated, though not entirely overturned, this picture.

Revisionists point out that guilds performed functions that markets of the period struggled to supply on their own. By certifying that a craftsman had completed a recognized apprenticeship, guilds furnished a signal of quality to buyers who could not easily assess goods before purchase. By enforcing standards and adjudicating disputes among members, they reduced the transaction costs of exchange in an era of weak public courts. And by organizing training, they helped transmit skills that were difficult to codify and could be acquired only through prolonged practice under a master. Where these functions were valuable, the revisionists argue, guilds may have raised rather than lowered economic efficiency.

Skeptics of the revisionist account do not deny that guilds supplied such services, but question whether the services required the exclusionary privileges that guilds in fact possessed. A body could in principle certify quality or train apprentices without also holding the legal power to bar non-members from practicing a trade. The persistence of that exclusionary power, the skeptics contend, is better explained by the guilds' interest in limiting competition than by any contribution to efficiency. The revisionists' functional benefits and the traditional view's monopolistic costs are thus not mutually exclusive; the live question is which predominated, and under what conditions—a question that the surviving records, weighted toward the affairs of the guilds themselves, do not straightforwardly answer.