Did the rise in anti-American sentiment caused by the Iraq war affect sales of US goods abroad? We address this question using data on soft drinks and fabric detergents sales in nine Arab countries. We find a statistically significant negative impact of the war on sales of US soft drinks in seven countries. The impact dissipates after a few months in two countries but persists in the other five. In the case of detergents, we only find a significant negative impact in one country. We conclude that international politics can sometimes affect consumer behavior and market outcomes.
Regression analysis with time series data is frequently used in marketing research. However, despite its popularity and ease of interpretation it cannot provide any information regarding the relations between marketing time series over different frequencies. This article proposes a new research tool, wavelet analysis, that when incorporated in regression analysis can provide some frequency domain insights about the effectiveness of marketing instruments over different cycles. In addition, by adopting appropriate regression-modeling techniques, wavelets can provide increased estimation and prediction accuracy of marketing causal effects.
This study examines gold's contribution to portfolio risk over different time scales. The analysis is based on wavelet decompositions of the variances and covariances associated with a portfolio that includes gold, stocks, 10-year government bonds and three-month Treasury bills. The results suggest that gold provides the lowest contribution to portfolio risk only when considered over medium-and long-term investment horizons.
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