In order to produce such implements of production as these, the exertion of faculties is required which are altogether exceptional, such as high scientific knowledge, invention, and many others.

Let invention--the most obvious of these--here do duty for all, and let us consider, for example, the mechanism of a modern cotton mill, or of a boot factory, or a Hoe printing press, or a plant for electric lighting.

All these would be impossible if it had not been for inventive faculties as rare in their way as those of a playwright like Mr.Shaw.
No one will deny that when a play like "Man and Superman" first acquires a vogue which renders its performance profitable, the royalties paid to the author are values which he has himself created, not indeed by his faculties used directly, but by his faculties embodied in a work which he has accomplished once for all in the past, and which has thenceforward become a secondary and indefinitely enduring self; and if this is true of the royalties resulting from its first profitable performance, it would be equally true of those resulting from the last, even though this should take place on the eve of the Day of Judgment.
With productive machinery the case is just the same.

If Mr.Shaw, instead of writing "Man and Superman," had been the sole inventor of the steam-engine, and the only man capable of inventing it, every one will admit that he would, by this one inventive effort, have personally co-operated for a time with all users of steam-power, and been part-producer of the increment in which its use resulted.

And if this would have been true of his invention when it was only two years old, it would be equally true now.