The second intrinsic ground upon which interest is defended, is the _service_ performed by the capitalist when he permits his capital to be used in production. Without capital, labourers and consumers would be unable to command more than a fraction of their present means of livelihood. From this point of view we see that the service in question is worth all that is paid in the form of interest. Nevertheless it does not follow that the capitalist has a claim in strict justice to any payment for this service. According to St. Thomas, a seller may not charge a buyer an extra amount merely because of the extra value attached to the commodity by the latter.[138] In other words, a man cannot justly be required to pay an unusual price for a benefit or advantage or service, when the seller undergoes no unusual deprivation. Father Lehmkuhl carries the principle further, and declares that the seller has a right to compensation only when and to the extent that he undergoes a privation or undertakes a responsibility.[139] According to this rule, the capitalist would have no right to interest; for as mere interest-receiver he undergoes no privation. His risk and labour are remunerated in profits, while the responsibility of not withdrawing from production something that can continue in existence only by continuing in production, is scarcely deserving of a reward according to the canons of strict justice. Whatever we may think of this argument from authority, we find it impossible to prove objectively that a man who renders a service to another has an intrinsic right to anything beyond compensation for the expenditure of money or labour involved in performing the service. The man who throws a life preserver to a drowning person may justly demand a payment for his trouble. On any recognised basis of compensation, this payment will not exceed a few dollars. Yet the man whose life is in danger would pay a million dollars for this service if he were extremely rich. He would regard the service as worth this much to him. Has the man with the life preserver a right to exact such a payment? Has he a right to demand the full value of the service? No reasonable person would answer this question otherwise than in the negative. If the performer of the service may not charge the full value thereof, as measured by the estimate put upon it by the recipient, it would seem that he ought not to demand anything in excess of a fair price for his trouble. In other words, he may not justly exact anything for the service as such. It would seem, then, that the capitalist has no moral claim to pure interest on the mere ground that the use of his capital in production constitutes a service to labourers and consumers. It would seem that he has no right to demand a payment for a costless service. _The Claims of Abstinence_