This paper studies dynamic competition in markets characterized by the introduction of technologically advanced next-generation products. Firms invest in new product effort in an attempt to attain industry leadership, thus securing high profits and benefiting from advantages relevant for the success of future product generations. The analysis reveals that when the current leader possesses highe...

Examining the Effectiveness of Positive Thinking Skills Training on High School Girls’ Achievement Motivation in Tehran A. Azimi Khoee Sh. Navabinejad, Ph.D. The present study was undertaken to examine the effectiveness of positive thinking skills training on high school girls’ achievement motivation in Tehran. The study was a quasi-experimental one with pretest/pos...