In a recent paper, Bennett McCallum (1982) lists what he considers to be prominent empirical regularities or of aggregate economies. In particular, he notes that . . output and employment magnitudes are strongly related to contemporaneous money stock surprises, [but that] ... output and employment magnitudes are not strongly and positively related to contemporaneous price level surprises (p. 4). These facts have prompted McCallum and others to develop models of the economy where prices as well as wages are predetermined. The main feature of such models is their abandonment of aggregate-supply formulations where price level disturbances provide a channel for the real effects of money. The purpose of this paper is to demonstrate the consistency of familiar Gray and Fischer wage-indexing models and their implied aggregate-supply relationship with the stylized facts (see JoAnna Gray, 1976; Stanley Fischer, 1977). In a model where the nominal wage is indexed to the price level, the efficient use of the information conveyed by the price level imposes qualitative restrictions on the covariance matrix of disturbances. First, the correlation between the price level and innovations in the deviation of actual output from the full-information output level will be zero. Second, because the money supply contains information about real disturbances that is not conveyed by the price level, the correlation between money supply innovations and innovations in the deviation of output from the full-information level will be positive. Third, the regression of innovations in actual output on the price level will provide an estimate of the optimal degree of indexation. Evidence that is generally consistent with these properties of wage-indexation models is found in quarterly data for the five largest OECD countries. Consider the familiar aggregate formulation: 1

In analyzing deterrence of large-scale entry, two classes of entry barriers may be distinguished. An innocent entry barrier is unintentionally erected as a side effect of innocent profit maximization. In contrast, a strategic entry barrier is purposely erected to reduce the possibility of entry. Two types of innocent barriers may also be distinguished. A postentry absolute advantage has the property that, if entry did occur, the established firm would be at a profit advantage over the entrant. Examples are superior technology or product design, patents, and lower input prices. A preentry asymmetry advantage arises from the fundamental preentry asymmetry between established firm and potential entrant. Before the entrant makes his entry decision, the established firm has already committed resources. This prior existence gives first-move advantages. The preentry asymmetry is independent of symmetry or asymmetry in the rules (the equilibrium concept) of the postentry game that might ensue; even if the postentry game will be played according to Nash-Cournot or entrant-as-leader rules, the preentry leadership

This paper is motivated by a sense that we as a profession need to understand, much better than we now do, how the world capital market works. We seem to be genuinely schizophrenic in the ways we build models-many of them are closedeconomy models in which the rest of the world does not even appear, yet others of them are models of the small, open economy in which hardly any degree of freedom is left for economic policy to influence events. Lying behind the schizophrenia is, I believe, a genuine ignorance on our collective part of how the world capital market

The work on the Phillips curve has been predominantly empirical, but policy intervention designed to decrease both inflation and unemployment requires a better theoretical understanding of the determinants of this relation. This paper attempts to sketch out the basic labor market relationships that appear to the author to account largely for the Phillips relation2 and then to consider the kinds of policy measures that this analysis suggests are relevant for moving the Phillips curve. The basic issue involved in the stability or instability of the Phillips curve when the inflation rate is constant is explored with a simple model in the appendix. The emphasis in this paper is on the atomistic operation of the labor market because it appears sufficient to generate the Phillips relation, but we do not deny that union bargaining and price dynamics may also be involved to some degree. This paper concentrates on conceptual issues. Continuing research will be devoted to the statistical measurement of relationships.

Regulation is likely to change both the level and direction of innovative activity in this country, but our knowledge both of regulation and of the innovation process is too primitive for us to tell precisely what these changes will be. Rather than make major changes in the regulatory process on the grounds that they will aid innovation, we are better advised to confine our attention to improving the general climate for innovation and altering those aspects of regulation that even casual investigation may suggest be deleterious. That, is the direction suggested by most recent important studies; their degree of caution is appropriate. 5 references.