Now I'm studying the article "Optimal High-Frequency Market Making". On page 3 there is a k in the formula of lambda for finding the number of the bid and ask executions by modeling them as a Poisson process. What is the k?

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    Are you sure you gave us the correct page? I selected your link, went to page 3, and didn't see a formula with a k. Please edit your question and add the formula in question.
    – Dan Bracuk
    Feb 7, 2020 at 17:38
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    On page 3: λ(δ) = Ae−κδ, assuming that's what he's referring to. Feb 7, 2020 at 17:56
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    I think that's a Greek kappa, which may cause some confusion, but may also help with a google search to find out what it means. Feb 7, 2020 at 18:54
  • Maybe try Mathematics SE.
    – Mattman944
    Feb 8, 2020 at 15:49

2 Answers 2


it is the rate of poisson process. Actually, k*t can be thought of as the expected number of events in the interval [0,t].


K is the fifth letter added to a four letter Nasdaq stock symbol indicating that the stock has no voting right. Or One of the fifth letters that denote something specifically about the stock

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    I think this is answering a completely different question. The question is about the mathematics of market analysis, not ticker symbols.
    – TripeHound
    Feb 11, 2020 at 7:45

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