Leon C. Marshall Quote
The materials collected in this volume are intended to acquaint the student with economic principles as they are manifested in the tangible facts of economic life. A few extracts of primarily theoretical character have been included to represent important aspects of contemporary or historic thought; but for the most part the selections are not so much authoritative formulations of economic laws as concrete case-material embodying such laws, or affording a background of information which the systematic treatises on economics can hardly give and which the teacher certainly cannot often assume that his students will possess.
James A. Field, Leon C. Marshall and Chester W. Wright. Materials For the Study of Elementary Economics, University of Chicago Press, 1913. Preface