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Rh one: and apart from this, they have a motive to labour more assiduously, and to adopt contrivances for making their labour more effectual. By these means they will generally succeed in compelling their land to produce, not only food for themselves, but a surplus for the new comers, wherewith to buy from them the products of their industry. The new settlers constitute what is called a market for surplus agricultural produce: and their arrival has enriched the settlement not only by the manufactured article which they produce, but by the food which would not have been produced unless they had been there to consume it.

There is no inconsistency between this doctrine, and the proposition we before maintained, that a market for commodities does not constitute employment for labour. The labour of the agriculturists was already provided with employment; they are not indebted to the demand of the new comers for being able to maintain themselves. What that demand does for them is, to call their labour into increased vigour and efficiency; to stimulate them, by new motives, to new exertions. Neither do the new comers owe their maintenance and employment to the demand of the agriculturists: with a year's subsistence in store, they could have settled side by side with the former inhabitants, and produced a similar scanty stock of food and necessaries. Nevertheless we see of what supreme importance to the productiveness of the labour of producers, is the existence of other producers within reach, employed in a different kind of industry. The power of exchanging the products of one kind of labour for those of another, is a condition, but for which, there would almost always be a smaller quantity of labour altogether. When a new market is opened for any product of industry, and a greater quantity of the article is consequently produced, the increased production is not always obtained at the expense of some other product; it is often a new creation,