Price security, we are told, is only a special form of sanitary security; the economic motive is secondary and subordinate; the state intervenes to make its inhabitants healthy, and not to make them rich. On that assumption we are asked to say that intervention will be upheld as a valid exercise by the state of its internal police power, though there is an incidental obstruction to commerce between one state and another. This would be to eat up the rule under the guise of an exception. Economic welfare is always related to health, for there can be no health if men are starving. Let such an exception be admitted, and all that a state will have to do in times of stress and strain is to say that its farmers and merchants and workmen must be protected against competition from without, lest they go upon the poor relief lists or perish altogether. To give entrance to that excuse would be to invite a speedy end of our national solidarity. The Constitution was framed under the dominion of a political philosophy less parochial in range. It was framed upon the theory that the peoples of the several states must sink or swim together, and that in the long run prosperity and salvation are in union and not division.