(a) The money in which the parties to a transaction have agreed that payment is to be made is the proper money of the claim for payment.
     (b) If the parties to a transaction have not otherwise agreed, the proper money of the claim, as in each case may be appropriate, is the money:

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        (1) regularly used between the parties as a matter of
    
usage or course of dealing;
        (2) used at the time of a transaction in
    
international trade, by trade usage or common practice, for valuing or settling transactions in the particular commodity or service involved; or
        (3) in which the loss was ultimately felt or will be
    
incurred by the party claimant.