Tulips!
All the rage if you were in Holland in 1682.
Anything.com, if you were, well...pretty much anywhere on Earth in 1997. The world was all about mutual funds in the 1960s, when professionals regularly beat the market (and yeah, uh, not so much today).
Are index funds' popularity today a fad, or a Thing? Time will tell. Fads are short-lived investing destinations that usually don't have a real raison d'etre. Their economic rationale is usually ambiguous at best, and they're sold as a product or a group too aggressively by brokers, bankers, and would-be interested parties.
What's not a fad? Well, if you believe that the world will get more crowded (and some mass outbreak of measles or weaponized ebola or a good ol' fashioned nuking doesn't wipe out a third of us), then you'd believe in buying real estate. Or really any scarce resource that lots of people want. Not a fad.
Pez dispenser collection? Yeah, that was a fad for 8 minutes in 1995. Hello, eBay. We heart our Popeye.
Related or Semi-related Video
Finance: What is a Bubble?5 Views
Finance allah shmoop what is ah bubble All right well
this is a bubble See what happened there got bigger
and bigger and bigger And then it popped and here's
the stock market from about nineteen Ninety two until about
two thousand It got bigger and bigger and bigger And
then it popped And yet was a bubble not just
a big fat bull market It was a crazy ludicrous
tulip mania Kind of time like start ups with almost
no revenues trading and billions of dollars Yep And tulip
mania That was a really thing One tulip sold for
forty grand go figure wasn't like if you ate it
you lived forever So yeah it was a bubble So
what caused the ninety nine bubble Well greed and it
wasn't good At least for some The internet had come
along It was a new thing consumers by the millions
could download in the privacy of their homes Art films
Yeah That's what we'll call them art films by the
terabyte money was flowing from silicon valley investors into startups
at record pace hoping to take advantage of this new
amazing internet thing and the valuations of companies got higher
And higher and higher Nasdaq went up some four hundred
percent in just half a dozen years and the blessed
cos traded at one hundred times trailing revenue not earnings
but revenue So if you think about the idea that
if you invest a dollar and you want to get
more than that back and that dollar comes from profits
of companies than one hundred times revenues cos we're probably
something like five hundred times earnings or more So for
one hundred dollars oven investment you've got like a dollar
of revenues in twenty cents of potential earnings Like maybe
a a decade later maybe yeah that's a bubble and
it burst At least you don't have that danger with
actual tulips or bitcoins Yeah they take bitcoins when you
buy tulips Would be kind of a good marriage there