What Tulip Mania Was Actually Trading

From late 1636 into February 1637, the price of certain tulip bulb futures in the Dutch Republic rose to extraordinary levels — a single Semper Augustus bulb reportedly traded for 5,500 guilders, more than ten times the annual wage of a skilled craftsman. Then, on the first Tuesday of February 1637, an auction in Haarlem failed to find buyers, and within days the futures market collapsed. The episode became the founding parable of speculative bubbles, retold by Charles Mackay in 1841 and by every business writer since.

The parable is largely a story Mackay made up. Modern historians, particularly Anne Goldgar in Tulipmania (2007), have gone through the actual notarial archives in Amsterdam and Haarlem and found something stranger and smaller. The active market was a few hundred wealthy merchants and craftsmen, not a national mania. Most trades were forward contracts settled in taverns over wine, with deposits of a fraction of the nominal price. Few bulbs ever changed hands at peak prices, because the bulbs were still in the ground.

The "crash" wiped out paper gains. Almost no one was actually ruined. The Dutch courts refused to enforce the contracts as gambling debts, and prices reset to a still-high baseline. The wider economy — shipbuilding, the Dutch East India Company, the herring fleets — kept growing.

What tulip mania really demonstrated was a then-novel financial instrument: the standardized futures contract on a perishable, variable good. Tulips were ideal because their bulbs split off offshoots called clusii that could be sold blind, with quality guessed from the parent. The Dutch had invented a way to trade an asset that did not yet exist, in volumes the underlying physical supply could not support. The 1637 episode taught a small market a lesson the wider 17th century then mostly ignored.