As a fan of Ronald Reagan and the economist Friedrich Hayek, Mr. Porter came naturally to the notion that Sandy Springs could push “the model” to its nth degree. His philosophical inclinations were formed by a life spent in private enterprise, and cemented by a visit to Weston, Fla., a town that had begun as a series of gated communities.

Mr. Porter tells this and other stories in “Creating the New City of Sandy Springs,” a book that will leave readers with one indelible lesson: incorporating a city is dull. Superduper dull. The book is composed mostly of the codicils, requests for proposals and definitions of duties that were required to jolt Sandy Springs to life. Without a love of minutiae and a very long attention span, forget it. But this is intended as a blueprint, not a gripping narrative. Mr. Porter regards the success of Sandy Springs as a way out of the financial morass that has engulfed so many cities in the aftermath of the Great Recession.

“Many are on the verge of bankruptcy,” Mr. Porter says. “They have significant unfunded liabilities, like pensions and other benefits. It’s almost like a poison that a lot of people are unaware of, and this model could be an answer.”

HOVERING around the debate about privatization is a basic question: What is local government for? For years, one answer, at least implicitly, was “to provide steady jobs with good wages.” But that answer is losing its political tenability, says John D. Donahue of the John F. Kennedy School of Government at Harvard. “A lot of jobs in government are middle-class jobs that in the private sector are not middle-class jobs,” he says. “People aren’t willing to support conditions for public workers that they themselves no longer enjoy.”

In a way, what Sandy Springs and other newly incorporated towns have done harks back to a 19th-century notion of taxation, which was much less about cross-subsidies and much more about fee for service.

“It was normal from around 1830 through the end of the Civil War for cities to be run like businesses,” says Mr. McKenzie, the “Privatopia” author. “When people paid property taxes, it was to get something that benefited them directly — like butchers wanting a certain area cleaned up.”

Sandy Springs residents still send roughly $190 million a year to Fulton County through property taxes, about half of which goes to schools, including those in Sandy Springs. But by incorporating, the town gets to keep $90 million in taxes a year to spend as it pleases.