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If you want millisecond updates, you need to use technologies other than json.


This is a resource you may want to look at. Additionally, this books seems good for this particular topic: Risk Without Reward: The Case for Strategic FX Hedging. Also, take a look at Advanced Bond Portfolio Management: Best Practices in Modeling and Strategies edited by Frank J. Fabozzi, Lionel Martellini, ...


It doesn't make sense to use the (co)variance(s) of asset values; if you did, by cutting an investment's share of the allocation by half, you would also cut its variance by a factor of 4. In a meaningful portfolio design, the volatility (variance) of an asset, by itself, is the same no matter how much or how little of your portfolio you put in it. Why ...

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