Harlan F. Stone,
Royal Indemnity Company v. United States…
“ But the rule governing the interest to be recovered as damages for delayed payment of a contractual obligation to the United States is not controlled by state statute or local common law. In the absence of an applicable federal statute it is for the federal courts to determine, according to their own criteria, the appropriate measure of damage, expressed in terms of interest, for non-payment of the amount found to be due. ”
