The speculator may be treated as an extreme case of undertaker, who deals exclusively with the business side of economic life rather than with the industrial side. But he differs in this respect from the common run of business men in degree rather than in kind. His traffic is a pecuniary traffic, and it touches industry only remotely and uncertainly; while the business man as commonly conceived is more or less immediately interested in the successful operation of some concrete industrial plant. But since the undertaker first broke into economic theory, some change has also taken place as regards the immediacy of the relations of the common run of undertakers to the mechanical facts of the industries in which they are interested. Half a century ago it was still possible to construe the average business manager in industry as an agent occupied with the superintendence of the mechanical processes involved in the production of goods or services. But in the later development the connection between the business manager and the mechanical processes has, on an average, grown more remote; so much so, that his superintendence of the plant or of the processes is frequently visible only to the scientific imagination. That activity by virtue of which the undertaker is classed as such makes him a businessman, not a mechanic or foreman of the shop. His superintendence is a superintendence of the pecuniary affairs of the concern, rather than of the industrial plant; especially is this true in the higher development of the modern captain of industry. As regards the nature of the employment which characterises the undertaker, it is possible to distinguish him from the men who are mechanically engaged in the production of goods, and to say that his employment is of a business or pecuniary kind, while theirs is of an industrial or mechanical kind. It is not possible to draw a similar distinction between the undertaker who is in charge of a given industrial concern, and the business man who is in business but is not interested in the production of goods or services. As regards the character of employment, then, the line falls not between legitimate and illegitimate pecuniary transactions, but between business and industry.