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60, recommended, as most conducive to the ends of classification; and I am still of that opinion.

But in applying the term wealth to the industrial capacities of human beings, there seems always, in popular apprehension, to be a tacit reference to material products. The skill of an artisan is accounted wealth, only as being the means of acquiring wealth in a material sense; and any qualities not tending visibly to that object are scarcely so regarded at all. A country would hardly be said to be richer, except by a metaphor, however precious a possession it might have in the genius, the virtues, or the accomplishments of its inhabitants; unless indeed these were looked upon as marketable articles, by which it could attract the material wealth of other countries, as the Greeks of old, and several modern nations have done. While, therefore, I should prefer, were I constructing a new technical language, to make the distinction turn upon the permanence rather than upon the materiality of the product, yet when employing terms which common usage has taken complete possession of, it seems advisable so to employ them as to do the least possible violence to usage; since any improvement in terminology obtained by straining the received meaning of a popular phrase, is generally purchased beyond its value, by the obscurity arising from the conflict between new and old associations.

I shall, therefore, in this treatise, when speaking of wealth, understand by it only what is called material wealth, and by productive labour only those kinds of exertion which produce utilities embodied in material objects. But in limiting myself to this sense of the word, I mean to avail myself of the full extent of that restricted acceptation, and I shall not refuse the appellation productive, to labour which yields no material product as its direct result, provided that an