“Castles continued to be the focus of economic activity as the center of an agricultural domain. Wealth continued to be measured in land and its produce. The only access the lord had to his wealth was to move from one estate to another consuming products from the harvests. Housing and feeding a household including retainers and servants required vasts amount of food and space for food preparation.”

Book II, Chapter I, On the Progress of Wealth, Section IX, p. 400 (See also: David Ricardo and aggregate demand)
Principles of Political Economy (Second Edition 1836)
Context: But such consumption is not consistent with the actual habits of the generality of capitalists. The great object of their lives is to save a fortune, both because it is their duty to make a provision for their families, and because they cannot spend an income with so much comfort to themselves, while they are obliged perhaps to attend a counting house for seven or eight hours a day...
... There must therefore be a considerable class of persons who have both the will and power to consume more material wealth then they produce, or the mercantile classes could not continue profitably to produce so much more than they consume.

Source: Our Enemy, the State (1935), p. 59
Context: There are two methods, or means, and only two, whereby man's needs and desires can be satisfied. One is the production and exchange of wealth; this is the economic means. The other is the uncompensated appropriation of wealth produced by others; this is the political means. The primitive exercise of the political means was, as we have seen, by conquest, confiscation, expropriation, and the introduction of a slave-economy. The conqueror parcelled out the conquered territory among beneficiaries, who thenceforth satisfied their needs and desires by exploiting the labour of the enslaved inhabitants. The feudal State, and the merchant-State, wherever found, merely took over and developed successively the heritage of character, intention and apparatus of exploitation which the primitive State transmitted to them; they are in essence merely higher integrations of the primitive State.
The State, then, whether primitive, feudal or merchant, is the organization of the political means. Now, since man tends always to satisfy his needs and desires with the least possible exertion, he will employ the political means whenever he can – exclusively, if possible; otherwise, in association with the economic means.

Source: https://www.youtube.com/watch?v=bNQTPE7gomU Kemi speaking on diversifying Nigeria's economy.

Source: Disease-Proof Your Child (2005), Ch. 4, pp. 148-149

Source: The One-Straw Revolution (1975), Chapter 3, pp. 103-104

Brexit: UK will apply food tariffs in case of no deal https://www.bbc.co.uk/news/uk-47291378 BBC News (19 February 2019) <br class="br">2019

Source: Stillness Speaks (2003), Chapter 3 The Egoic Self

The Notebooks of Leonardo Da Vinci (1938), XVII Flight

Anarchism: Its Philosophy and Ideal (1896)
Context: The masses have never believed in sophisms taught by economists, uttered more to confirm exploiters in their rights than to convert exploited! Peasants and workers, crushed by misery and finding no support in the well-to-do classes, have let things go, save from time to time when they have affirmed their rights by insurrection. And if workers ever thought that the day would come when personal appropriation of capital would profit all by turning it into a stock of wealth to be shared by all, this illusion is vanishing like so many others. The worker perceives that he has been disinherited, and that disinherited he will remain, unless he has recourse to strikes or revolts to tear from his masters the smallest part of riches built up by his own efforts; that is to say, in order to get that little, he already must impose on himself the pangs of hunger and face imprisonment, if not exposure to Imperial, Royal, or Republican fusillades.
But a greater evil of the present system becomes more and more marked; namely, that in a system based on private appropriation, all that is necessary to life and to production — land, housing, food and tools — having once passed into the hands of a few, the production of necessities that would give well-being to all is continually hampered. The worker feels vaguely that our present technical power could give abundance to all, but he also perceives how the capitalistic system and the State hinder the conquest of this well-being in every way.
Far from producing more than is needed to assure material riches, we do not produce enough.