The Sources of Income.

§1. In all modem societies the two chief sources of income are the performance of work ¹ and the ownership of property. Within the category of work we may, for certain purposes, draw various broad distinctions, as, for example, between comparatively skilled and comparatively unskilled work, or between brain work and manual work, or between those who work on their own account, such as doctors, lawyers, artists, and employers of labour, and those who work under the supervision of another. It is possible, however, to reach certain general conclusions concerning the aggregate income from work, without taking account of the great differences which exist both in the nature of various kinds of work, and in the amount of income obtainable in various occupations.