This dissertation consists of three chapters that represent a contribution to the research on the role of product quality in international trade. The first chapter presents an empirical analysis of the relationship between the volatility of bilateral trade flows and the quality of products exported. We argue that, under the hypothesis of non-homothetic preferences, the variability of income generates larger fluctuations of the demand of high-quality imported products. Our findings indicate that a possible drawback of exporting high-quality products is represented by the higher exposure to income variability of destination countries. The second chapter sets up an empirical analysis on cross-country panel data to estimate the effect of the qu...