But there is a peculiarity in the agricultural market which exercises a very powerful influence in raising rents. Most manufactured articles can be dispensed with, or their consumption greatly lessened, if their cost of production is largely increased, or the means of buying diminished. It is otherwise with food: it must be had, must be bought, if any means of purchasing it exist. The effect of this force on a country situated like England is very marked. England cannot supply food for more than half of her population; the other half must be procured from abroad. Now, the principle which governs the price of indispensable food is the law, that the price paid for the dearest article--say, a loaf of bread--which must and will be bought, will impose itself on all like articles which are actually purchased. When the loaf made in England was cheaper than any imported from abroad, then the price of the English loaf rose to the price of the dearest foreign loaves which were sold and purchased in the English markets. This extra-addition of price was a pure surplus of profit received by the English grower of wheat; the cost of production was not changed, nor his requirement of profit for himself augmented. The gain he thus realized, being absolutely surplus profit, passed to the landowner. The need of foreign corn raised his rent. But the picture has a reverse side. It may well happen that the foreign corn landed in England will be saleable at a lower price than the English. If the supply can be furnished in sufficient quantity to provide bread enough for all England, the English corn in that case must inevitably sink to the level of the foreign--its price will fall, the profit realized on its sale may indefinitely sink, and a great reduction of rents throughout England may well be the inevitable consequence. The only weapon wherewith to fight off the disaster would be such a modification of British agriculture as would lead to the cultivation of other crops than wheat.