THE BLACK DEATH
“Civilization both in the East and the West was visited by a destructive plague which devastated nations and caused populations to vanish. It swallowed up many of the good things of civilization and wiped them out. It overtook the dynasties at the time of their senility, when they had reached the limit of their duration. It lessened their power and curtailed their influence. It weakened their authority. Their situation approached the point of annihilation and dissolution. Civilization decreased with the decrease of mankind. Cities and buildings were laid waste, roads and way-signs were obliterated, settlements and mansions became empty, dynasties and tribes grew weak. The entire inhabited world changed. The East, it seems, was similarly visited, though in accordance with and in proportion to [the East’s more affluent] civilization. It was as if the voice of existence in the world had called out for oblivion and restriction, and the world responded to its call.”

—tr. Rosenthal

THE NEW SCIENCE
“This science then, like all other sciences, whether based on authority or on reasoning, appears to be independent and has its own subject, viz. human society, and its own problems, viz. the social phenomena and the transformations that succeed each other in the nature of society…. It seems to be a new science which has sprung up spontaneously, for I do not recollect having read anything about it by any previous writers. This may be because they did not grasp its importance, which I doubt, or it may be that they studied the subject exhaustively, but that their works were not transmitted to us. For the sciences are numerous, and the thinkers belonging to the different nations are many, and what has perished of the ancient sciences exceeds by far what has reached us.”

—tr. Issawi

OVERCROWDING AND URBAN PLANNING
The commonest cause of epidemics is the pollution of the air resulting from a denser population which fills it with corruption and dense moisture…. That is why we mentioned, elsewhere, the wisdom of leaving open empty spaces in built-up areas, in order that the winds may circulate, carrying away all the corruption produced in the air by animals and bringing in its place fresh, clean air. And this is why the death rate is highest in populous cities, such as Cairo in the East and Fez in the West.”

—tr. Issawi

THE PERNICIOUS EFFECTS OF DOMINATION
A harsh and violent upbringing, whether of pupils, slaves or servants, has as its consequence that violence dominates the soul and prevents the development of the personality. Energy gives way to indolence, and wickedness, deceit, cunning and trickery are developed by fear of physical violence. These tendencies soon become ingrained habits, corrupting the human quality which men acquire through social intercourse and which consists of manliness and the ability to defend oneself and one’s household. Such men become dependent on others for protection; their souls even become too lazy to acquire virtue or moral beauty. They become ingrown. …This is what has happened to every nation which has been dominated by others and harshly treated.”

—tr. Issawi

TAXES
In the early stages of the state, taxes are light in their incidence, but fetch in a large revenue; in the later stages the incidence of taxation increases while the aggregate revenue falls off. …Now where taxes and imposts are light, private individuals are encouraged to actively engage in business; enterprise develops, because businessmen feel it worth their while, in view of the small share of their profits which they have to give up in the form of taxation. And as business prospers the number of taxes increases and the total yield of taxation grows. However, governments become progressively more extravagant and start to raise taxes. These increases [in taxes and sales taxes] grow with the spread of luxurious habits in the state, and the consequent growth in needs and public expenditure, until taxation burdens the subjects and deprives them of their gains. People get accustomed to this high level of taxation, because the increases have come about gradually, without anyone’s being aware of exactly who it was who raised the rates of the old taxes or imposed the new ones. But the effects on business of this rise in taxation make themselves felt. For businessmen are soon discouraged by the comparison of their profits with the burden of their taxes, and between their output and their net profits. Consequently production falls off, and with it the yield of taxation. The rulers may, mistakenly, try to remedy this decrease in the yield of taxation by raising the rate of taxes; hence taxes and imposts reach a level which leaves no profit to businessmen, owing to high costs of production, heavy burden of taxation and inadequate net profits. This process of higher tax rates and lower yields (caused by the government’s belief that higher rates result in higher returns) may go on until production begins to decline owing to the despair of businessmen, and to affect the population. The main injury of this process is felt by the state, just as the main benefit of better business conditions is enjoyed by it. From this you must understand that the most important factor making for business prosperity is to lighten as much as possible the burden of taxation on businessmen, in order to encourage enterprise by giving assurance of greater profits.

—tr. Issawi