Men, it has been well said, think in herds; it will be seen that they go mad in herds, while they only recover their senses slowly, and one by one ~ Charles Mackay
Extraordinary Popular Delusions and the Madness of Crowds is a history of popular folly by Scottish journalist Charles Mackay, first published in 1841.
Among the bubbles or financial manias described by Mackay are the South Sea Company bubble of 1711–1720, the Mississippi Company bubble of 1719–1720, and the Dutch tulip mania of the early seventeenth century. (some tulip bulb varieties briefly became the most expensive objects in the world during 1637)
A great book …. worth a read…