The debate over precisely what brought about the Great Depression has raged for nearly a century. Contemporaries initially blamed the stock market crash, which in reality was more of a reaction to the building Depression than a cause. Other points of blame include the collapse of the German financial system in 1931, which according to one author triggered an international liquidity crisis that led to the banking crisis in the United States. (See “Did Germany Contribute to the U.S. Great Depression?” Winter 2019–2020.) As evidenced by the subtitle of this book, former Fortune writer Christopher Knowlton points his finger at the bursting of the Florida real estate bubble as a major cause.

I had heard disparate references to the Florida real estate bubble during my research on the history of financial crises. But, before finding this book, I was not familiar with any of the underlying details of the Florida boom and bust. The story is fascinating.

Satisfactory ways to spend money: Typical of many tales about the ups and downs of the economic and financial cycle, Knowlton tells his story through colorful characters that he unearthed during his research. He begins with a pioneer of Florida’s development, “the Gilded Age oil tycoon Henry Flagler.” Flagler developed a business model for tourism in Florida that would ultimately draw millions of 20th century visitors and inhabitants. He wrote of the state:

I liked the place and the climate, and it occurred to me very strongly that someone with sufficient means ought to provide accommodations for that class of people who are not sick, who come to enjoy the climate, have plenty of money, but could find no satisfactory way of spending it.

Flagler took some of his gains from the Standard Oil Trust and built the Hotel Ponce De León and Alcazar in St. Augustine. He also accumulated railroads, an industry he was familiar with since his Standard Oil days, to enable well-off travelers to traverse the many miles from northern states to their destination in the sun. Knowlton credits Flagler with creating “the main infrastructure artery … for the next great boom in the state’s astonishing development.”

The bubble begins in earnest: When we think of Florida today, we think of a massively populated state of more than 20 million people (third largest, behind California and Texas). But at the beginning of the 1920s, Florida was known as the “last American frontier,” a place that was largely undeveloped, with a population of less than 1 million (smaller than Nebraska).

The next phase of Knowlton’s narrative describes how Florida began growing that population. This section takes up much of the book and focuses on the ups and downs of the empires of what he refers to as the four “real estate kings” of early 20th century Florida: Carl Graham Fisher, George Merrick, Addison Cairns Mizner, and David Paul Davis. Knowlton also traces the life of a contemporary of the real estate kings: writer and conservationist Marjory Stoneman Douglas.

Each of the real estate kings would make his mark in developing Florida communities. Arriving in 1910, Fisher focused on Miami Beach. Merrick came in 1911, with his attention on Coral Gables. Architect Mizner showed up in 1918, with an eye on Palm Beach and nearby Boca Raton. Davis was a native of Florida who focused on Tampa. Knowlton comes to a harsh assessment of these main characters as he spends time on their compulsive, and increasingly questionable, work to build their sometimes gaudy empires and their behavior outside of work hours: “All four men began to blur the truth and to employ more and more hyperbole in order to sell their dream of wealth, glamour, sex and fun — a dream they themselves now subscribed to wholly.”

He also focuses on how the developers carried on their personal lives consistent with their sometimes-dodgy business practices: “Three of them … had one other failing in common: they were prone to ‘habitual intemperance’.… Each developed a serious drinking problem.” It must be remembered that this was during the time of the Volstead Act (prohibition). Knowlton continues: “What really intoxicated … the developers themselves was not the promise of sex or liquor but insatiable greed.”

In contrast, Douglas, who arrived in Miami in 1915, wrote of Florida, “I recognized it as something I had loved and missed and longed for all my life.” In the narrative, she comes across as a model citizen, as Knowlton describes her building her modest bungalow in Coconut Grove, writing a book on the preservation of the Everglades, and her broader work as an advocate for the environment. President Clinton awarded Douglas the Presidential Medal of Freedom in 1993, when she was 103 years of age.

The bubble begins to deflate: Knowlton’s chronicle of the boom period drags on a bit too long, extending for half of the book. The reader will likely be ready to hear the story of the bust by that point.

By the mid-1920s, signs of trouble were percolating, but funds from the now bubbling stock market extended the party just a little bit longer: “The soaring stock market itself was now contributing to the land boom, as investors followed the adage that you should make your money on Wall Street and invest it on Main Street.” The real estate kings at times took their money off the table but would then “double down” by leveraging and investing their gains in an ever-growing number of new real estate projects.

Finally, by mid-July 1926, some segments of the media were beginning to predict the end of the bubble in the sun. For instance, The Nation wrote: “The Florida boom has collapsed. The world’s greatest poker game, played with building lots instead of chips, is over.”

A big turning point was a Category 4 hurricane that struck Miami in September 1926. It devastated a 30-mile swath of the east coast of Florida, leaving nearly 400 dead and 18,000 homeless along with an estimated $7 billion in losses (in today’s dollars). Making matters worse, another hurricane struck Palm Beach in late 1928 with a far higher death toll: high winds caused flooding in numerous settlements and ended up “drowning 1,800 to 2,500 mostly black Bahamian and Haitian farmworkers.” Optimism about Florida’s favorable year-around climate turned into pessimism about how easily a hurricane could turn real estate investments into rubble or put them underwater (literally).

One sure sign that ongoing problems in the real estate sector were spilling over into the financial system was the failure of Palm Beach National Bank, just up the coast from Miami. The bank provided much of the funding for Mizner’s development of lots in Boca Raton. Notwithstanding efforts by the Federal Reserve Bank of Atlanta to prop up the institution, Palm Beach was “forced to shut its doors” in late June of 1926. Mizner’s Development Corporation would end up in bankruptcy. In total, 40 banks in Florida would fail during 1926. Knowlton explains that the two Palm Beach banks that went down as a result of the Mizner bankruptcy led to a “contagion” that spread to a chain of banks across Florida and Georgia.

Knowlton tries to make a connection between the bust in Florida and the Great Depression:

Today there is a growing awareness that the real estate collapse was a major reason for why the Great Depression ran so long and so deep…. I believe the collapse of the Florida land boom pricked the national real estate bubble of the twenties, causing the initial contraction in the economy to begin.

Yet, his argument is not convincing and does not support the commitment of a subtitle to the connection with the Great Depression. To Knowlton’s credit, he does acknowledge that “we need to be wary of single, or monocausal, explanations for any event.”

Rags for the kings: When Florida real estate investments showed the early signs of spiraling downward, the four real estate kings’ personal lives also descended, with marriages disintegrating, supplemented by reliance on alcohol for comfort. One by one, Knowlton traces the lives of the kings who were so prosperous during the early 1920s.

In October 1926, Davis “disappeared overboard” while on a cruise aboard the White Star liner RMS Majestic. At the time, he was divorcing his second wife and preparing to marry his mistress. By 1930, Mizner “was so broke that he had to borrow from friends,” including songwriter Irving Berlin. He passed away by 1933. The value of Fisher’s holdings in Miami plummeted after the hurricane and his clean-up expenses brought him down further. Ultimately, a different real estate project in the then-humble fishing village of Montauk, Long Island, “dragged him under” as it was completed just about the time of the 1929 crash. He would pass away by 1939. Merrick’s investments withered as “the capstone of his Coral Gables development, the Biltmore Hotel, faltered financially and [was foreclosed upon] in October 1929. He would suffer two nervous breakdowns and a bout of “heavy drinking” before passing away in 1942.

Knowlton’s summary chapter, entitled “A Legacy of Greed and Folly,” preaches about the lessons learned from the kings’ separate fates: “From one viewpoint, the Florida land boom is a familiar story of middle-aged men, behaving badly — financially, maritally, and all too often morally — in a manner that seems especially unsurprising today.”