THE MAGNITUDE OF PRICING ERRORS IN THE ARBITRAGE PRICING THEORY

In this paper the arbitrage pricing theory (APT) pricing errors for individual securities are estimated employing maximum likelihood factor analysis and Fama-MacBeth style aggregation. Results show that the pricing errors are large and statistically significant and that there is a high degree of variability in pricing errors across securities. This evidence contradicts the prevailing APT intuition that the pricing errors can be ignored as negligible. Pricing errors are also found to be related to residual variance and firm size.     

Globalization—then and now

Book reviewed in this article:
K. O'Rourke and J. Williamson, Globalization and History     

Drivers of ad spend trends among global marketers

This research study attempts to examine whether there is consistency in the advertisingto-sales ratio (%) pattern for global marketers in their home region and at a worldwide level, through a systematic sequence of analyses. It attempts to understand the variation in the advertising spend to sales ratio for the home region and global markets for a sample of marketers by analysing along the variables of category (surrogate for advertising task), region (home base) and companies themselves. This has been done by applying the C&RT technique of the automatic interaction detector (AID) family. The key point emerging from this analysis is that, at every level, the category is the main determinant for explaining the variation in global advertising to spend ratio as well as the home region advertising to spend ratio.