ABSTRACT
The first part of this book has been entirely theoretical. Assumptions have been made-some less, some more realistic-and the im plications of these assumptions have been worked out. The process has been entirely in the realm of logic. Like problems in arithmetic or geometry, the conclusions reached, if logically correct, are implicit in the assumptions explicitly stated or inferred. Nothing new has been added by the analysis except a clarification of what is implicit in the combined assumptions. Any theory, however logical, must therefore be tested by the appeal to fact if it is to be a practical guide to policy. This chapter aims to open up the problem of making such an appeal.
