Each of these uses is logically independent as a cause of value, yet all are mutually related, the value of cattle to a particular person being determined by the consideration of all the uses united into one scale of varying gratification.
Sec.3.

#Money as a valuable tool.# Money is often, by a figure of speech, called a tool.

A tool is a piece of material taken into the hand to apply force to other things, to shape them or move them.
Figuratively, this is what money does.

A man takes it not to get enjoyment out of it directly, but to apply force, to move something, and that which he moves is the other commodity.

Money thus (as money) is always an indirect agent.