From the introduction in the 1918 edition:
We need a bible that shall give us facts concerning business principles, acceptable and honorable principles that apply to new methods, new morals, new needs. We need a bible that shall teach us to be well, and how to keep well; that will inspire us to obey the common laws of health; that will teach us how to exercise, work, play, think; how to breathe and to eat. We need instruction in the democracy of man's own self, the family, the town, the State, the general government. Europeans say that America has no poor. Americans want to make this literally true. America demands that man shall be economically free, and she gives the opportunity. So the American Bible must treat of Economics the highest science man has yet discovered.