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

...is easy enough to understand. Even labor original: "industry"; here referring to the productive work or service of individuals is sometimes in circulation and sometimes not, depending on whether it is currently seeking work or is already employed.

For the same reason, an object stops being in circulation the moment it is set aside—whether for personal use original: "consumption", for export to another market, or because it was accidentally destroyed. It is also withdrawn if the owner changes their mind about selling original: "withdrawn by the caprice of its owner", or if it is held back at a price so high that it effectively counts as a refusal to sell.

Because supply consists only of those goods available at the current market price, any item whose cost of production rises above that level will stop being produced and will no longer be part of the supply. Therefore, the supply will be more plentiful when the current price is high, and more limited original: "scanty" when that price has declined. (c) See the translator's note below regarding the author's phrasing here.

In addition to these universal and permanent limits on supply and demand, there are others of a temporary and accidental nature that always work alongside the permanent ones.

For example, the prospect of a successful wine harvest original: "abundant vintage" will lower the price of all wine currently in stock, even before a single large barrel original: "pipe"; a large cask for wine or spirits, typically holding about 126 gallons of the expected harvest has been—

(c) This is not very clearly expressed. The author’s meaning probably is that the supply is abundant in proportion to how well the current price rewards the productive effort original: "productive agency" spent bringing the article to market. On his own principles, the supply of goods is most abundant when they require the smallest amount of productive effort and are therefore the cheapest. The author's position is only correct in this specific sense. — Translator.