§ 14. #Insurance rather than penalty#. The principle of social insurance rather than that of legal penalty should be universally recognized. At present, in all countries where the several kinds of insurance are found side by side, accidents are indemnified on plans that are still rooted in the notion of employers' liability for negligence; whereas, necessarily, the indemnity in case of sickness and of old age has no such explanation. The unfortunate result of this difference of view is that whereas all cases of sickness and invalidity entitle to benefits, only those accidents suffered "in the course of employment" are indemnified, and the worker is left unprotected in a large share of the accidents to which he is liable. The worker's need and the social need are thus not adequately met. We have started along the same line of development in America, and it is to be feared that only through a long series of legal fictions and contradictory judicial decisions shall we be able to work out toward consistency in this matter. Another unfortunate result of this difference is that accident compensation, being made peculiarly the task of the employers, does not develop the spirit of responsibility on the part of the workers and of coöperation between them and employers that other forms of insurance call forth, where representatives of both parties sit together in the administration of the system. § 15. #The compulsory principle#. Insurance must be general in its application to all the persons within broad wage-earning classes, and in order to be general it must necessarily be compulsory, not voluntary, in its application. To leave any form of insurance optional, or elective, with either employers or wage-workers, is to fail of the main purpose in a large proportion of the individual cases where it is most needed, and to increase the expense to those that are included. Within a compulsory system, however, there should be given wide opportunity for the voluntary principle by admitting to the system others that are not compelled to insure, and to enable any insured person to increase his paid-up, nonforfeitable insurance at any time by extra payments made at times of unusually high wages, from legacies, or from any other exceptional income. § 16. #State insurance and a unified system#. The state, through the public insurance office, must ultimately be the sole agency for insurance. Only in this way can the maximum of simplicity and economy be attained. Of course, this calls for a better appreciation of expert training, and a broader sentiment in favor of the merit system in the public service than we yet have in America.