“Professional” services, such as those of Economists, Engineers, Architects, Clergymen, Lawyers, Physicians and Teachers are in the Economic domain of Trade. Not only are they exchanged for tangible commodities, but they contribute to the production of such commodities by conserving, and it may be by increasing the efficiency of more obvious producers. The Economist studies productive relationships for the purpose of securing harmonious industrial adjustments; and so vital is his function that righteous social relationships are imperiled, and righteous readjustments obstructed, if he mistakes chaos for order. The Engineer designs, plans and directs; and so important is his function that the work of hosts of producers depends upon it. If he mistakes, great structures may fall. The Architect is an Engineer in a special sense: if he makes mistakes, buildings may lack stability or beauty or both. The Lawyer may disentangle societary complications that would operate as a check upon production and Trade. The Clergyman may discourage obstructive conduct; the Physician may conserve the health of more direct producers so as to increase their efficiency; the Teacher may increase their efficiency by instruction. And so of personal services of the Personal Servant type. Whatever a Personal Servant may do for a commodity specialist which otherwise the specialist must do for himself at the cost of contributing less to the production of tangible commodities, is to that extent a contribution to the production of those commodities. Interchanges of human service, if the interchangers act in freedom, each getting from the channels of Trade the equivalent in service of the service he renders, are contributions to Economic production. The relative desirability of human services rendered in promoting production, whether directly or indirectly, is commonly as well as commercially and Economically known as Value, which, as already explained, is expressed in Money terms and compared by Money measurements. To receive a share in the continuous distribution of commodities through Trade is the human motive for all Economic activity, from leadership in Economic service to service for “wages.” A “wage-worker,” for illustration, lends a hand--becomes “a hand,” if you please,--at harvesting wheat. His compensation is to be, let us assume, his food and lodging during harvest and twenty dollars in Money at the end of his job. The work being done, his food and lodging having been meanwhile supplied to him, and the twenty dollars in Money having been duly paid him, what has been the Economic nature of his transaction? Has not this “harvest hand” exchanged his contribution of service to the production of wheat, for his living while helping to produce it and for a twenty-dollar measurement of any commodity or commodities he may wish to draw from the channels of Trade?