Cole v. Sands

The common selling price, and not the lowest, nor highest, ought to be the guide to the jury in estimating the value of the iron or other specific article.

The act respecting interest is a positive institution, and imperative upon the courts of law, in allowing interest when the act has directed it. Other cases are left as they were at common law, where the jury have an equitable power and may in the form of damages give interest, if they think justice requires it: but it would seem just and consistent with legal principles, that no man should be subject to damages derived from a consideration of interest unless debtor knew precisely the debt he had to pay, or the duty to be performed; where the debt or duty is uncertain no interest ought to be allowed. To authorize the jury to consider damages beyond the amount of what they may conceive due, the demand ought to be certain and specific, and not subject to controversy, as in mutual unsettled accounts unless interest upon the balance was part of the original contract.(7)