This article calls attention to the usefulness of an often neglected but basic tool of the economist's trade—the art of writing so as to carry ideas as exactly as possible from one mind to another, and sometimes from one part of one mind to another part of the same mind. Writing is a tool...

Comparisons of successive frequency distributions may be made in two distinct ways that are frequently confused. One way is to make comparison against a given set of class intervals covering the relevant range of the data. The result is a fixed frame of reference, a single classification grid....