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 wealth. Economic justice is to render what is due not only to each individual but to each function, social or personal, that is engaged in the performance of useful service, and this due is measured by the amount necessary to stimulate and maintain the efficient exercise of that useful function. This equation between function and sustenance is the true meaning of economic equality.

Now to apply this principle to the adjustment of the claims of the community on the one hand and the producers or inheritors of wealth on the other would involve a discrimination of the factors of production which is not easy to make in all instances. If we take the case of urban land, referred to above, the distinction is tolerably clear. The value of a site in London is something due essentially to London, not to the landlord. More accurately a part of it is due to London, a part to the British empire, a part, perhaps we should say, to Western civilization. But while it would be impossible to disentangle these subsidiary factors, the main point that the entire increment of value is due to one social factor or another is sufficiently clear, and this explains why Liberal opinion has fastened on