No matter how hard you model you won’t be able to predict processes that are fundamentally unpredictable. And you would get fooled because you only observe finite amount of data.
It is surprising how complicated the math gets even if you try to model very simple processes (eg think of the n-body problem and how complexity increases with every addition of a body). It is not a given that complicated models mean you’re modelling a complicated process.
But when people say "finance is science" what they usually mean is "here is the complicated math that proves you can't lose money on this, we've modeled everything".
As the joke goes, 6 sigma events happen in finance every week.
100% agree. When I was an algorithmic derivatives trader, we joked that the math was there to scare up investors and scare off compliance. Little did we know...
That's a great science joke.
This is like saying physics is not science because the nutjobs claiming we will recieve divine revelation by praying to "the quantum energy field" use physics-y terms in their BS.
I feel like they are infinite? Because, for example, in hyperinflation, there's no upper bound on how long someone is going to keep printing money.
Any given instance will stop at a finite number, but you can't bank of that being the high water mark.
It's like the notion of a 100-year flood. Of course there could be a tsunami or a dam failure that completely inundates an entire city, but at some point you've got to accept a small risk and ensure you are covered for it.
OP's claim was that quantitative finance was *hard science*. Requirements regarding predictability are way more stringent than merely observing stuff and seeing how it responds to an input.
These are colloquial terms [1]. We might as well argue about whether Pop Tarts are ravioli or tacos sandwiches.
Colloquial terms whose concrete meaning does not correspond to OP's claim.
There is no ambiguity in this: if your models are not testable and fail to predict behavior then it's not hard science.
If you follow the scientific method, it's science. If you write an observational essay, it's not. You can build theories around falsifiable, replicable experiments pertaining to the madness of crowds. The error bars are longer. But they are not infinite.