We investigate a dynamic advertising model where product quality is endogenous. In the differential game between single-product firms, there exists a parameter range where the low-quality firm uses a more efficient advertising technology and earns higher profits than the rival. Moreover, we show that equilibrium qualities are the same under duopoly, multiproduct monopoly and social planning, th...

Why Mergers Reduce Profits and Raise Share Prices — A Theory of Preemptive Mergers* by Sven-Olof Fridolfsson and Johan Stennek We explain the empirical puzzle why mergers reduce profits and raise share prices. If being an “insider” is better than being an “outsider,” firms may merge to preempt their partner merging with a rival. The stock-value of the insiders is increased, since the risk of be...

While dynamic matching markets are usually modeled in isolation, assuming that every agent to be matched enters that market, in many real-world settings there exist rival matching markets with overlapping pools of agents. We extend a framework of dynamic matching due to Akbarpour et al. [2] to characterize outcomes in cases where two such rival matching markets compete with each other. One mark...

Fake and misconducted scientific articles are misleading the researchers; it can also impose a huge cost on the academic centers and health system. Finally invalidated published research may give rise to incorrect treatment guidelines that may harm the patients. Based on our search in retraction watch database, 10 retracted orthopedic articles were from Iran. All the reported retracted article ...