Re: [Haskell-cafe] What is a safe Haskell data type to store and manipulate Money values?

From memory: At StanChart the Haskell library is mostly used in Financial Market for derivatives pricing, the accounting and actual payment processing is done by other back-office softwares. So Double was used to represent "simulated" values (the price of a derivative being the NPV of expected cash flows) and for computing actual payments rounding rules are used with the relevant decimal (based on ISO 4217 tables).

On Tue, Apr 4, 2017 at 5:16 PM Saurabh Nanda wrote:

Curious to know what StanChart is using to represent monetary values in its Haskell code.

-- Saurabh.

On Tue, Apr 4, 2017 at 8:20 PM, Joachim Durchholz wrote:

Am 04.04.2017 um 16:13 schrieb ALeX Kazik:

Leaving aside the legal aspects of this, what would be Haskell's equivalent of the BigDecimal format in Java (or Ruby)? Decimal (as used by hledger)?

Rational?

You'd be constantly be doing explicit calculations to get back to a denominator of 100. Plus you'd have to deal with those cases where the denominator is a divisor of 100, and you'd need explicit nonstandard conversion to strings.

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