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The legibility of displayed letters depends upon their size, or more accurately, their subtended visual angle at any viewing distance. Current design standards recommend letter heights in the range from 0.003 to 0.007 rad (10 to 24 mill of arc) for good viewing conditions, with 0.0015 rad (5 min) considered a lower limit based on normal visual acuity. A field study involving some 2000 measures for over 300 printed displays found a mean letter height of 0.0019 rad (7 min) at the limit of legibility, with over 90% legibility at 0.003 rad and virtually 100% at 0.007 radians.

To compare the effects of group size on cooperation, we introduce a class of simple multiperson games. These games can be regarded as n-person generalizations of the two-person prisoner's dilemma with expected value payoffs. In order to ensure that identical expected-value monetary alternatives are available to players in different-sized groups, we introduced a certain formal constraint on payoffs. Results of an experimental study comparing three-and seven-person groups show that the smaller-sized group is markedly more cooperative than the larger group. The primary emphasis of this paper is methodological. It demonstrates a technique to measure cooperation as a function of group size unconfounded by role-playing and utility considerations.

An attempt to clarify the role of firm size (measured in N of employees) in the deterioration of an institution's efficiency (institutional entropy) in response to a "test" of entropy theory, as it had been expounded in an earlier paper ("The GPITPC and Institutional Entropy", Public Choice, Fall, 1974). The "test" looked at the effect of age on efficiency for a sample of firms that were very small & therefore--based on the general private interest theory of public choice (GPITPC)--could not be expected to exhibit entrophy. Other variables affecting entropy, in addition to size, are also discussed. AA.