Naked Economics

Who feeds Paris? It’s a question economists use to capture something almost miraculous: every morning, a fruit vendor in a Paris neighborhood has fresh papayas from Brazil, coffee from Colombia, and tuna that was swimming in the South Pacific just days before. None of this happens because a government planner ordered it. It happens through billions of daily transactions, each driven by individuals and businesses pursuing their own interests. The same invisible machinery that stocks that fruit stand has also made a 25-inch color television drop from costing 174 hours of wages in 1971 to less than 10 hours today. This is the world of markets—flawed, messy, but staggeringly effective at coordinating human activity without central control.

At its core, economics is about how we allocate scarce resources. The foundational assumption is that individuals try to maximize their utility—whatever brings them satisfaction—while businesses try to maximize profits. These twin forces set prices through supply and demand. When a business can charge different customers different prices for the same flight, that’s price discrimination, a strategy to capture more profit. But here’s the crucial insight: every voluntary transaction in a market makes both parties better off, or they wouldn’t agree to it. Even sweatshops in developing countries, however uncomfortable by Western standards, offer workers a better option than the alternatives available to them.

But self-interest alone doesn’t always produce good outcomes. Incentives are powerful, and they can backfire spectacularly. Consider the black rhinoceros in Africa: because it is endangered, its horns become more valuable, which increases poaching, which makes it more endangered—a vicious cycle. The solution isn’t to moralize; it’s to change the incentives so local people want the animals alive. The same logic explains Mexico City’s failed attempt to reduce pollution by banning cars one day per week: people simply bought cheap, more-polluting second cars. When incentives are misaligned, you get what economists call perverse outcomes. The principal-agent problem—where an employee’s interests don’t match the company’s—helped cause the 2007 financial crisis, as bank employees took excessive risks with mortgages because they pocketed short-term bonuses while the firm bore the long-term losses.

When there’s a gap between private costs and social costs—what economists call externalities. A dog owner who leaves waste on a public walkway creates a social cost (someone might slip and face medical bills) that the owner doesn’t pay. Climate change is the largest externality of all: businesses burn coal for energy, but the planet bears the existential cost. Governments can ban the behavior or tax it, and taxes are often smarter because they let people decide while raising revenue. Beyond externalities, government provides essential public goods like military defense and basic research that the private sector won’t, and it protects property rights—the legal foundation without which markets cannot function.

But government can also do enormous harm. Excessive regulation doesn’t protect consumers; it protects existing businesses from competition. In Illinois, established manicurists lobbied for stricter licensing requirements specifically to keep out cheaper immigrant-run shops. In Peru, economist Hernando de Soto spent 42 weeks and $1,231 trying to legally open a one-person clothing stall—31 times the monthly minimum wage. Regulation and corruption go hand in hand. Taxes can also create deadweight loss: when income taxes are high enough, married women who are high-income earners may simply stay home rather than work, which hurts the economy without raising revenue. The US sugar quota costs consumers $3 billion annually while protecting a few thousand sugar growers.

Information is another battlefield. When one party knows more than another, markets break down. McDonald’s doesn’t sell the best hamburger; it sells predictability. A traveler driving through Nebraska at 9pm will choose McDonald’s over Chuck’s Big Burger because she knows exactly what she’s getting. Branding solves information asymmetry. But when information asymmetry goes unchecked, you get problems like adverse selection in insurance: only people who expect to need expensive care buy generous policies, which drives up premiums for everyone. The Hope Scholarships program failed because students knew more about their future career earnings than Washington bureaucrats did—only low-income earners opted in, making the program unsustainable.

What explains why Bill Gates is so much richer than you? Human capital—the sum of your skills, education, and experience. The market rewards scarcity, not social value. A college graduate earns 10% more annually than someone without a degree, and the poverty rate is over ten times higher for high school dropouts than for college graduates. Human capital makes up 75% of a modern economy’s wealth. Productivity—the efficiency with which we convert inputs into outputs—is what makes us richer over time. The average work year fell from 3,100 hours to 1,730 over the twentieth century, while real GDP per capita rose from $4,800 to nearly $60,000. Technology makes smart workers more productive and low-skilled workers redundant, which is why 85% of the 5.6 million US manufacturing jobs lost between 2000 and 2010 went to automation, not trade. The lump of labor fallacy—the belief that there are only so many jobs to go around—is false. The personal computer revolution created millions of net new jobs.

Financial markets look complicated, but they do just four things: raise capital, protect savings, insure against risk, and allow speculation. Farmers use futures contracts to lock in crop prices before harvest. Insurance companies issue catastrophe bonds to spread risk from natural disasters. The efficient markets theory holds that prices reflect all available information, which means you can’t consistently beat the market by picking hot stocks. Index funds, which simply track the market, outperform professional fund managers over the long term. The rules for investing are simple: save, invest, take calculated risk, diversify, and stay long-term. Get-rich-quick schemes always fail for the same reason fad diets do—the only proven approach is slow and steady.

Politics distorts economics through the logic of concentrated benefits and diffuse costs. Small groups care intensely about policies that benefit them, while the general public barely notices the cost spread across millions of taxpayers. The ethanol subsidy survives because corn is grown in Iowa, pivotal to presidential primaries. The Trans-Pacific Partnership was scrapped despite every single economist in a University of Chicago poll agreeing that trade with China makes most Americans better off. When government protects entrenched groups through subsidies and tax breaks, it hobbles creative destruction—the necessary process by which new industries replace old ones. It was a great time to be in computing in the 1990s, but a terrible time to be in the electric typewriter business.

The book closes with eight questions that will shape our economic future. Will we choose to work less and find more utility in nonmaterial things? Will we accept higher inequality or sacrifice some growth for a stronger social safety net? Can China remain authoritarian while continuing to grow? Will the United States ever break its habit of deficit spending? These aren’t predictions; they’re choices. Economics doesn’t foreordain the future any more than physics made it inevitable that we would put a man on the moon. John F. Kennedy didn’t alter the laws of physics; he set a goal that required good science to achieve. The same is true for the kind of society we want. We can decide whether we want strip malls in 2050 or something more beautiful. The tools of economics—incentives, markets, and an understanding of human behavior—are just tools. We must decide how to use them.