Abstract
Extant marketing research holds that customers prefer frontline personnel to speak the customers’ first language. Furthermore, current managerial practices instruct frontline employees to either use the customers’ first language or, in international settings, to use English. Through five studies in different retail and service contexts, we identify situations where the opposite is true. The results of the first two studies suggest that if customers initiate contact in a second language, the frontline employee's switch to the customer's first language constitutes an identity threat leading customers to feel less satisfied; an effect we term the language backfire effect. Our third study extends these results to a domestic context to test for the impact of linguistic acculturation on how immigrant customers perceive frontline employees’ language switch. The fourth study replicates the findings in a real-life retail context. These results present a paradox for marketing research: although frontline employees switch to customers’ first language to accommodate them, these actions might not have the desired consequences. Having identified and described the problem of the language backfire effect, our final study introduces and verifies a managerially actionable solution: combining the language switch with a language proficiency compliment offsets the language backfire effect.