Extraordinary Popular Delusions And The Madness Of Crowds was published in 1841 and the complete text is available online. You’ve heard of Tulip-mania, the Crusades and alchemy. There are a few other interesting topics covered in this book that you may not be aware of. From the introduction to Volume 1:

“In reading the history of nations, we find that, like individuals, they have their whims and their peculiarities; their seasons of excitement and recklessness, when they care not what they do. We find that whole communities suddenly fix their minds upon one object, and go mad in its pursuit; that millions of people become simultaneously impressed with one delusion, and run after it, till their attention is caught by some new folly more captivating than the first.”

Alas, this being 1841, the Dot Com phenomena is not covered, but it probably fits into the Tulip template quite well.