Tulip mania wasn’t irrational. Tulips were a newish luxury product in a country rapidly expanding its wealth and trade networks. Many more people could afford luxuries – and tulips were seen as beautiful, exotic, and redolent of the good taste and learning displayed by well-educated members of the merchant class. Many of those who bought tulips also bought paintings or collected rarities like shells.
Prices rose, because tulips were hard to cultivate in a way that brought out the popular striped or speckled petals, and they were still rare. But it wasn’t irrational to pay a high price for something that was generally considered valuable, and for which the next person might pay even more.
Tulip mania wasn’t a frenzy, either. In fact, for much of the period trading was relatively calm, located in taverns and neighbourhoods rather than on the stock exchange. It also became increasingly organised, with companies set up in various towns to grow, buy, and sell, and committees of experts emerged to oversee the trade. Far from bulbs being traded hundreds of times, I never found a chain of buyers longer than five, and most were far shorter.
And what of the much-vaunted effect of the plague on tulip mania, supposedly making people with nothing to lose gamble their all? Again, this seems not to have existed.
That is from Anne Goldgar, there is much more at the link, including an explanation of how the myths about Tulip Mania spread, fake news basically. Here is her earlier book on the topic, here is an earlier Peter Garber piece.