§ 2. The limitation to production from the properties of the soil, is not like the obstacle opposed by a wall, which stands immovable in one particular spot, and offers no hindrance to motion short of stopping it entirely. We may rather compare it to a highly elastic and extensible band, which is hardly ever so violently stretched that it could not possibly be stretched any more, yet the pressure of which is felt long before the final limit is reached, and felt more severely the nearer that limit is approached.
After a certain, and not very advanced, stage in the progress of agriculture, it is the law of production from the land, that in any given state of agricultural skill and knowledge, by increasing the labour, the produce is not increased in an equal degree; doubling the labour does not double the produce; or, to express the same thing in other words, every increase of produce is obtained by a more than proportional increase in the application of labour to the land.
This general law of agricultural industry is the most important proposition in political economy. Were the law different, nearly all the phenomena of the production and distribution of wealth would be other than they are. The most fundamental errors which still prevail on our subject, result from not perceiving this law at work underneath the more superficial agencies on which attention fixes itself; but mistaking those agencies for the ultimate causes of effects of which they may influence the form and mode, but of which it alone determines the essence.
When, for the purpose of raising an increase of produce, recourse is had to inferior land, it is evident that, so far, the produce does not increase in the same proportion with the labour. The very meaning of inferior land, is land which with equal labour returns a smaller amount of produce. Land may be inferior either in fertility or in situation. The one requires a greater proportional amount of labour for growing the produce, the other for carrying it to market. If the land A yields a thousand quarters of wheat, to a given
