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Quantitative Finance
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BigChief
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Why do institutional Traders prefer Short Selling instead of Buying Puts?
you probably had bigger exposure to the underlying buying put options
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Alternative to tradertest.org for mental math practice
added 76 characters in body
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 Teacher
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Alternative to tradertest.org for mental math practice
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Is the Interactive Brokers API suitable for hft?
it's 250ms, source ib help desk
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Autoregressive distributed lag models ADL(p,q) howto in preferably matlab (stata/R/python/C# etc)
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How to calculate return rates with negative prices?
There is no real 'law' of supply and demand because humans are irrational. They probably pay you because they need to get rid of the electricity very badly. Characteristics of electricity which are very important: non-storability and inelasticity of demand.