As we know,
There are known knowns.
There are things we know we know.
We also know
There are known unknowns.
That is to say
We know there are some things
We do not know.
But there are also unknown unknowns,
The ones we don't know
We don't know.
Taleb is simply telling us that unknown unknowns -- the real surprises -- are always present and always mispriced. It's not a traditional risk that is included in some risk premium.
OK, ha has told me that I'm casting my net too far (among other things). That's good.
I don't disagree with anything said above, but I still need to interpret it into usable information for me.
Unknown unknowns: Yup, they exist. And there really is no way we can use them or do anything about them, and we especially cannot make money off them. In order to make money, you need to place your bet; if you don't know
where to place the bet, how can you bet? If you know
where, you automatically know something, so it isn't unknown any longer. There are no odds that can be found about something that is unknown,and this is especially true if you don't know it is unknown. To me, at least at this point, Taleb doesn't make sense to me. Unless you can point me toward better explanation of what he means?
Known unknowns: This to me is the juicy area, the real place where Black Swans, both positive and negative, exist. To me this says, for example, we can't know what specifically those dang pesky terrorists are thinking (the unknown) but we certainly know they are thinking nasty things (the known). This sort of stuff has an infinite number and variety of possibilities.
1) We can know something bad is going to happen and just not know where or when or how.
2) We can know something good is going to happen on our birthdays, but not know what or where or who.
3) We can be day traders and
know that a stock is acting peculiar that day, but
not know why. And further, we may know that it is acting peculiar and in a way that historically has indicated a large movement up in price or a large movement down. (More of these later.)
As I see things we really do have a large number of unknowns out there in the financial world. But they all exist somewhere in time and space, these unknowns. So we can point them out as "in a place" (where?: the financial markets or the options market or . . . ) and "in a specific time" (when?: the future, within the next few days, before my calls expire . . . ).
I really have to have a better definition of unknown unknowns to do a better job of criticism. Can you help? Otherwise I'm stuck thinking Taleb didn't think things thru.
The Great Depression happened unexpectedly (an unknown) to many folks. And many of these same folks that didn't know it was coming also didn't know what the consequences would be after the first day of the DOW crash. Obviously an unknown unknown to some. Others saw it coming (known--at least partially) and got the heck out of the way because they knew what the consequences were (known--at least partially).
My conclusion so far: The human mind plays an enormous role in knowing and not knowing and, consequently, acting. Ask Rumsfeld [-]what he knew about Iraq before he went in
[/-]? Ask Osama, who knew ahead of time, well before Rumseld figured it out, that Iraq would be at minimum a mess? Who of these two appears to have better judgment about Iraq today, at this point in time? Did someone partial know what was unknown to Rumsfeld?