A Treatise on Political Economy - The Production, Distribution, and Consumption of Wealth

...is reduced, because it can only be obtained by those who can afford to pay for it. The ability to buy does not increase based on the same factors that cause prices to rise. For example, in England, the great majority of the population is completely prevented from consuming wine original: "vinous liquors" and many other items. Obtaining these goods requires giving up so much in terms of other products or productive effort original: "productive agency"; the labor and resources used to create value. that only those with a significant surplus of either can afford them. In these situations, not only is the total number of consumers decreased, but the amount each individual consumes is also reduced. Even if a coffee drinker is not forced to give up the beverage entirely when the price goes up, he must at least reduce original: "curtail" his consumption. This effect is similar to having two individuals where one stops using the product entirely while the other remains able and willing to continue.

In business speculation, since the buyer is not purchasing for their own personal use, they adjust their purchases based on what they expect to sell. Because the quantity they can sell depends on the price they can afford to offer, they will buy less as the price rises and more as it falls.

In poor countries, even the most basic items of low cost are often beyond the financial means of a large portion of the population. There are countries where shoes, though inexpensive, are unaffordable for most inhabitants. The price of this good original: "commodity" does not drop to a level...