It is quite otherwise, in the case of indispensable goods, as for instance, wheat. When there is a want of such an article, men prefer to dispense with all other articles, to some extent, rather than to practice frugality in bread; and all the more, as bread is not so much used as consumed rapidly, while clothes and metallic articles last a long time. And even after an over-abundant harvest, leaving voluntary waste out of the question, consumption is increased by a finer separating of the flour, an increase in the amount of corn fed to cattle, and the distillation of spirits. Hence, demand and supply by no means run in parallel lines at every moment; and indispensable articles tend to greater perturbations in price than those which can be dispensed with.(617)(618) The price of grain, especially, varies in a ratio very different from the inverse ratio of the amount of the harvest;(619) although a formula therefor expressed in figures, like that of Gregory King, can never be applicable universally.(620) Farmers must everywhere and always withhold a certain amount of their harvest for seed, for home use etc., from the market. Only absolute necessity can induce them to draw on the quantity thus laid by. But the ratio of this part to the whole is very different in different countries.(621) In the higher stages of civilization, where payment in money has taken the place of payment in produce, and all other kinds of payment, and where the cultivator of the ground pays the wages of his laborers almost exclusively in money, so that they, like all others, purchase what bread they require in the market; a given deficit in the harvest must be spread over a much larger market supply; and prices, therefore, remain much less affected than in the lower stages of civilization.(622) And so, it is clear that a like bad harvest must affect prices very differently, if there be a large importation or exportation of the means of subsistence, and if several bad harvests, or several harvests yielding more than the average have preceded. In another respect yet, the price of indispensable commodities is very sensitive, because here the mere fear of a future want of them has a far deeper and wider influence, than has the fear of want of articles of luxury. No matter how good the wheat crop may have been, if the weather afterwards interferes with its harvesting, the price of wheat, in countries in which the spirit of speculation is on the alert, will certainly rise, because the prospect of the future crop then becomes somewhat doubtful.(623) Section CIV. Influence Of Purchaser’s Solvability On Prices.