Building on a sociological perspective, this study empirically examines how transformation expectations relate to conspicuous consumption and impulse buying by comparing Eastern (Thai) and Western (U.S.) consumers to scrutinize how consumers from completely different cultural and economic profiles diverge from each other with respect to their product/service expectations and their purchase and consumption tendencies. While Thailand represents a small developing economy, the U.S. denotes a large developed nation. Furthermore, Thai culture is characterized by a relatively high uncertainty avoidance, large power distance, femininity, and collectivism, whereas American culture is viewed as an individualist, masculine, risk-taking, and small power distance one (Hofstede, Hofstede & Minkov, 2010). The relationships set forth in this study are woven together based on the expectations states theory (EST), which generally bridges consumers’ expectations with their actions (i.e., the behaviors of buying impulsively and consuming conspicuously in this study). Our focal construct, transformation expectations, is treated as a second-order construct, consisting of four dimensions: “self-,” “relationship,” “hedonic,” and “efficacy” transformations. We postulate that transformation expectations positively influence conspicuous consumption and impulse buying, and that the relationships are moderated by culture. The data were collected from consumers in Thailand and the U.S. using a self-administered survey by means of quota and purposive sampling techniques. Our final sample size consists of 347 Thai consumers and 320 American consumers. The findings in this study show support for all hypothesized relationships. Both Thais and Americans tend to consume more conspicuously and purchase more impulsively when they have higher expectations that a product enables them to transform their lives. Surprisingly, the test of the moderating effect of culture showed a stronger relationship amongst Thai consumers. This finding contradicts to previous empirical evidences suggested in the literature. Future study thus should replicate and/or extend this study to confirm and validate the results so that appropriate marketing strategies can be tailored to fit diverse groups of consumers across the globe.