Let's just call it down the middle? The 'explain it to me like a child' was two-fold. Yes, maybe part of it was to explain to a dithering audience. But the use of those actual words, Irons' expressions and follow-up (how he got to where he is) was purposeful to illustrate how (relatively) 'complex' the trenches might be and that even great manager/CEOs back then might not have fully understood the risks or what was going on (clearly the case)...
There are a myriad of other ways to do the whole 'explain to the dumb audience' trick so I think it is fair to say that was at least part of it...
Also I replied to someone earlier but it got buried so in case they miss it:
Your statements are not entirely accurate. The movie was based on complicated Math Equations. Traders would not and do not know those equations. They trade in milliseconds and rely on FRACTIONS of a penny to make money. The people who make these equations are called "Quants". I've seen their resumes. I saw a guy with an M.I.T. PhD, who had worked with Nuclear Reactors and had all kinds of statistical requirements a "Quant" could meet and the firm *STILL* said he was not good enough. These guys come from a different planet, the code monkeys and I guarantee you the Paulson's, et.al of the world do not have a clue what a Quant equation looks like, much less that a "day in the life" of a Quant is.
1. The movie was not based on complicated math equations. The 'risk management engine/system' is based on complicated math equations. I am pretty sure the point of the movie was to describe a day in a (semi-mock/semi-real) financial firm that came to the brink prior to the full-fledged '08 crisis and how individuals at that firm in various levels dealt with it...
2. Traders DO NOT typically trade in milliseconds and rely on fractions of a penny -- certainly not at banks, although bid-ask has shrunk (especially for cash equity business). Yes, what you describe as high-frequency trading (which I personally loathe) does do that and trade on micro seconds and fractions of pennies per share, to the point that they try to be physically 'closer' to certain exchanges so they save 'time' on electronic transmission, etc.
The Asset Backed Security (ABS), Mortgage Backed Security (MBS), CDO/CLO, etc (collectively lets just call it the structured credit market)--it DOES not trade that way. Cash or synthetic. For starters even in 2007 it was not 'extremely liquid' (say like selling 100 shares of IBM or buying 100 futures lots of NYMEX WTI) so the 'dealer community' (Citi, Goldman, Deutsche, MS, etc) making markets requires a much larger premium, things trade over the counter (OTC) and usually on a bespoke basis, with a lot more credit analysis because there are so many unique issues on vintages, credit triggers, collateralization, etc....in short, it is in no way like you describe.
3. Yes -- a good trader will understand the main equations and drivers of profit and loss (pnl)--DV01, correlation and gamma, recovery ratios, etc. for his products. Structured credit traders are usually more 'math-y' and can have PhD or Masters Financial Engineering etc (though not required all the time) and most of the big shops in US the desks are actually full of Indians, Jews and Asians (or foreigners in general if you will).
Also, quants and structurers will sit right on or near the traders on the desk at most shops.
4. The fact that you refer to it as a 'Quant equation' or 'day in the life' of the Quant was kind of funny, too. The 'day' is rather boring staring at Excel, MatLab, SQL, etc. al day and testing models, fine-tuning the risk engine, PnL, etc.
John Paulson is a dick but a brand now. He is their to manage his fund and think big strategically and to raise funds or maintain (after his disastrous 2011) his client relations. He doesn't need to understand every detail of how to write or program his models or do valuations/stress test every security. He (should) understand the results of stress tests, inputs and sensitivities and the general risks...
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