The Elusive Quest for Growth: Economists' Adventures and Misadventures in the Tropics: Summary & Key Insights

After World War II, the world seemed full of possibility. Economists were the new builders of nations, armed with theories and calculations that promised to turn war-torn or newly independent countries into industrial powerhouses. The development profession was born from optimism: if the rich had achieved prosperity through industrialization, surely the poor could replicate it with enough capital and planning. I trace in this book the lineage of this optimism—from the early works of Harrod and Domar to the rise of planning ministries across the developing world.

In those years, economists saw themselves as architects. The world’s poor nations were viewed as empty canvases awaiting the right blueprints: five-year plans, target ratios of investment to income, predicted paths of capital accumulation. The belief was that growth was mechanical—if you increased savings and investment, output would rise proportionally. We used equations that seemed elegant, but they turned out to be deceptive: they lacked the friction of human reality.

The optimism was not without beauty. Newly independent states—from India to Ghana—embraced the promise of modernity. The World Bank and IMF stood ready to provide funds, guidance, and validation. Yet, as the decades rolled on, results fell short. Countries that were supposed to boom instead struggled. Economists revised their theories, introducing aid programs and adjustment plans, but each new idea preserved the same core fallacy: that experts could engineer growth without accounting for incentives, politics, or institutions. This historical tour reveals how good intentions, repeated through generations, fossilized into what I call the Great Repetition—where every new plan unknowingly reenacted the old failures.

The Harrod-Domar model was the earliest cornerstone of development economics. It declared that growth depends primarily on the rate of savings and investment—if a country saves more, it can invest more, and therefore grow faster. To a generation of policymakers, this sounded like divine simplicity. Just raise investment, and growth will follow. That assumption gave rise to the financing gap theory, under which aid agencies tried to fill the gap between desired investment and actual savings.

But this model ignored how investment actually works. Factories and roads do not create prosperity by existing; only productive use does. In many developing countries, investment projects were poorly conceived, mismanaged, or even corruptly diverted because the incentives to make them efficient were weak. The model assumed that money transforms automatically into capital, and capital automatically into productivity. The missing element was motivation—the human factor that drives efficiency. When people have no stake in outcomes, capital becomes wasted concrete.

As I show through repeated examples, from Africa’s aid-funded infrastructures to Latin America’s decades of underperforming public industries, the failure lay not in insufficient funds but in distorted incentives. Governments controlled resources but not results. Aid agencies counted disbursements, not achievements. The Harrod-Domar dream became the Harrod-Domar trap: each failure justified more aid, and more aid deepened the dependency, leaving incentives unchanged. Growth never emerged because capital without efficiency is nothing more than accumulation.