Preface to the Seventh Edition [1871]∗

The present edition, with the exception of a few verbal corrections,3 corresponds exactly with the last Library Edition and with the People's Edition. Since the publication of these, there has been some instructive discussion on the theory of Demand and Supply, and on the influence of Strikes and Trades Unions on wages, by which additional light has been thrown on these subjects; but the results, in the author's opinion, are not yet ripe for incorporation in a general treatise on Political Economy.† For an analogous reason, all notice of the alteration made in the Land Laws of Ireland by the recent Act, is deferred until experience shall have had time to pronounce on the operation of that well-meant attempt to deal with the greatest practical evil in the economic institutions of that country.

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