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RFR's will be compounded in-arrears, if I have an option on this rate am I forced to use Monte Carlo or are there techniques in the literature that will price path-dependent trades with a backwards pricing method (PDE/lattice etc)?

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    $\begingroup$ It depends on what payoff you are thinking. For many of them, transition from IBORs to RFRs poses no analytical challenge. What product did you had in mind? $\endgroup$ Nov 4, 2020 at 16:56
  • $\begingroup$ Let’s assume I want to price a caplet type cashflow in Hull-White model in a backwards numerical method, this is an example that doesn’t carry over from IBOR to RFR due to asianisation of the payoff. $\endgroup$ Nov 4, 2020 at 20:50
  • $\begingroup$ Just to clarify I’m not after closed form solutions. $\endgroup$ Nov 5, 2020 at 7:35

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Yes you can price Asian-style options in PDEs, by introducing an extra state variable which is the accumulated Asian variable (in your case the RFR rate). It is well covered in literature, a quick Google search on "pricing Asian options in PDE" should bring plenty of results. For example this, equation (3) shows the PDE to solve. Notwithstanding your comment, for caplets on RFR rates in the Hull-White model there are closed-form solutions.

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    $\begingroup$ Welcome to Quantitative Finance Stack Exchange Mr. Piterbarg. $\endgroup$ Nov 6, 2020 at 12:47
  • $\begingroup$ What Daneel Olivaw said. $\endgroup$ Nov 6, 2020 at 13:14
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    $\begingroup$ Pleasure to be here! $\endgroup$
    – piterbarg
    Nov 6, 2020 at 13:34
  • $\begingroup$ Thank you and welcome. Since posting the question I happened to find the same answer in your book :) $\endgroup$ Nov 6, 2020 at 15:25
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    $\begingroup$ :-) I did not want to say "read my book" in the answer! $\endgroup$
    – piterbarg
    Nov 6, 2020 at 15:28

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