There is little serious basis for disputing plaintiff's entitlement to prejudgment interest on the sum which he paid defendant under protest. Whether plaintiff's cause is construed as a claim for restitution, or as one for damages for breach of contract, Pennsylvania law allows, as a matter of right, the recovery of interest on liquidated sums unjustly withheld. See W. D. Rubright v. International Harvester Co., 358 F. Supp. 1388 (W.D.Pa.1973) (restitution); Palmgreen v. Palmer's Garage, 383 Pa. 105, 117 A.2d 721 (1955) (architect's fee); Barium Steel Corp. v. Wiley, 379 Pa. 38, 108 A.2d 336 (1954) (damages under stock purchase agreements). See generally, Restatement of Restitution § 156; Restatement of Contracts § 337. Such interest is to be computed from the time the liquidated amount was payable and, if a demand is necessary, demanded. Sun Shipbuilding & Dry Dock v. U. S. Lines, Inc., 439 F. Supp. 671 (E.D.Pa.1977). In this case, therefore, interest will be taxed from the date Crown received the disputed interest payment and concurrently received formal notification that plaintiff contested its right to retain the money.
What remains to be determined is the rate at which the interest due is to be computed. Plaintiff argues for "money-market rates." During the period in which Crown has wrongfully retained his money, plaintiff has been forced to borrow, paying interest ranging from 8.5% to 12.25%. And while plaintiff has had to borrow, Crown has had the use of the money to make further loans at rates presumably in the neighborhood of the 21/2 points above prime which Crown charged plaintiff for the loan which is the root of this litigation. Plaintiff also emphasizes that from January of 1976 to the present-the period during which he has been deprived of his money-the purchasing power of the dollar has decreased more than 29%. Unless a rate of interest is assessed which is steep enough to force Crown to disgorge any profit it has made by the use of plaintiff's money, and to compensate plaintiff for the costs he encountered as a result of Crown's action, Crown will have profited from its wrongful act and plaintiff will remain, despite a judgment on the merits, a substantial loser in the controversy.
There is considerable logic in plaintiff's contention that 21/2 points above prime would be a singularly equitable measure of prejudgment interest in this case. It is, however, a contention which appears to be without support in the Pennsylvania cases. "Under Pennsylvania law, six percent is the applicable interest rate in contract-related claims." Sun Shipbldg. & Dry Dock Co. v. U. S. Lines, Inc., supra, at 677 n. 7, citing Miller v. City of Reading, 369 Pa. 471, 87 A.2d 223 (1952) ("Whenever one man binds himself to pay a specific sum of money to another by a certain day, and he fails to do so, he becomes liable, by the law of this State, to pay interest thereon at the rate of six per cent per annum afterwards, as long as he shall improperly withhold payment thereof "). The figure of six per cent is not mystically derived. It is a figure established by the Pennsylvania legislature as the legal rate of interest. It applies in all circumstances where interest would normally be due and a contrary rate has not been established by the parties. 41 P.S.A. § 202. Reference to money market rates as a measure of interest in an action to recover funds unreasonably detained has been rejected by my brother Hannum as unauthorized under Pennsylvania law. Formigli Corporation v. Fox, 348 F. Supp. 629 (E.D.Pa.1972).
Suggesting that a more liberal view of the applicable rate of interest prevails in equity, plaintiff attempts to characterize this action as not principally a contract dispute, but one "sounding in restitution," for the recovery of a sum extracted under duress. Although, relying on the rule for interest stated in the Restatement of Restitution § 156,
interest has been permitted in certain non-contractual situations, six percent remains the appropriate measure. Nationwide Mutual Ins. Co. v. Philadelphia Elec. Co., 443 F. Supp. 1140 (E.D.Pa.1977).
Plaintiff's attempt to draw a distinction between the events of this case, and the usual breach of contract case, is unconvincing. Wrongfully demanding, and in turn accepting, a sum paid under protest, is not conduct persuasively more culpable than refusing to release funds due and owing under a contract. The inequity in the result-allowing the wrongdoer the beneficial use of the funds, at a relatively low rate of interest, and therefore with some net gain as the result of his wrongdoing-is the same. But, however culpable the conduct, and however high the prevailing rate of interest, there is no latitude under Pennsylvania law for the court to impose interest at a rate higher than that established by the Pennsylvania legislature.
Plaintiff will be awarded interest at the rate of six percent per annum from the date of his payment under protest.
Defendant contests plaintiff's right to costs. Federal Rule of Civil Procedure 54(d) provides that:
Except when express provision therefor is made either in a statute of the United States or in these rules, costs shall be allowed as of course to the prevailing party unless the court otherwise directs
Plaintiff prevailed by way of motion for summary judgment. He is thus a "prevailing party" within the meaning of the rule. And plaintiff has not "unduly extended or complicated resolution of the issues." ADM Corp. v. Speedmaster Packaging Corp., 525 F.2d 662, 665 (3d Cir. 1975). He will therefore be allowed his costs, those costs to be taxed by the Clerk.