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Such is the idea which the writer of the present work has kept before him. To succeed even partially in realizing it, would be a sufficiently useful achievement, to induce him to incur willingly all the chances of failure. It is requisite, however, to add, that although his object is practical, and, as far as the nature of the subject admits, popular, he has not attempted to purchase either of those advantages by the sacrifice of strict scientific reasoning. Though he desires that his treatise should be more than a mere exposition of the abstract doctrines of Political Economy, he is also desirous that such an exposition should be found in it.

The present fifth edition has been revised throughout, and the facts, on several subjects, brought down to a later date than in the former editions. Additional arguments and illustrations have been inserted where they seemed necessary, but not in general at any considerable length.

CHAPTER VII. On what depends the degree of Productive-
ness of Productive Agents.

§ 1. Land, labour, and capital, are of different productiveness

at different times and places.

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CHAPTER IX. Of Production on a Large, and

Production on a Small Scale.

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§ 1. Means and motives to saving, on what dependent

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