If you want to work in quant finance, don't do MFE/CQF. Get a degree in math, physics, CS or EE like ~90% of existing quants.https://twitter.com/paulg/status/1416002575862804482 …
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This seems like the kind of thing that might be implemented at CFM but not in many other places.
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Well JS, Citadel are the MM I know for sure that they are using optimal control strategies.
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Well JS uses it :p and most monetary risk measures involve high order spaces like Banach (VaR for instance)
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HJB is very very useful in MM. Especially for designing optimal quotes. It's used a lot also in portfolio management (portfolio liquidation) and in derivative pricing (American option, bermudan option.. Etc).
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Lol. Some of the market makers I know can barely write their own name, let alone work with Sobolev spaces

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I spilled my coffee
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That’s interesting. Market making *is* a stochastic control problem though isn’t it? It’s surprising to me if it doesn’t find any use at all in practice.
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If you can say anything about the dynamics of the CLOB and you want to find the optimal thing to do, that’s a control problem. Maybe the problem is so trivial you don’t need stoch control theory to solve it? Maybe the challenge is to find true things about the dynamics of LOB?
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