The main aim of this study is to investigate the impact of real interest rate on investment level in Jordan over the period (19902005). A cointegration analysis with three variables (investment level, real interest rate, and income level) is employed. Two unit root tests (Phillips-Perron test and Augmented DickeyFuller test) have been exploited to check the integration order of the variables. T...

This paper examines a two-period mixed market model in which a welfaremaximizing public firm and a profit-maximizing private firm can use inventory investment as a strategic device. It is then demonstrated that the equilibrium in the second period coincides with the Stackelberg solution where the private firm is the leader, and at equilibrium, both social welfare and the private firm’s profit a...

We expose a theorem of Pila and Wilkie on counting rational points in sets definable in o-minimal structures and some applications of this theorem to problems in diophantine geometry due to Masser, Peterzil, Pila, Starchenko, and Zannier.

William L. Wilkie is Nathe Professor of Marketing, University of Notre Dame (e-mail: [email protected]). How Did This Issue Come About? For much of my career, I have been intrigued with trying to comprehend what the field of marketing is actually about (and what it might be about, what it could be about, what it should be about, and so forth). In recent years, I have joined with my colleague Eliza...

In 1981, Paris and Wilkie [21] indicated it was an open question whether IΣ0 would satisfy the Second Incompleteness Theorem for Herbrand deduction. We will show that IΣ0 will both obey and defy the Herbrandized version of the Second Incompleteness Theorem, depending on which of several equivalent definitions of IΣ0 one examines.