Purpose The social transformation of “disadvantaged segments of society” requires an in-depth understanding of their behavioural reactions in different social contexts. To this end, the present study focuses on individuals who become vulnerable owing to their functional illiteracy in an “English”-dominant marketplace. Thus, the purpose of this study is to understand the sources of stress as perceived by functionally illiterate individuals and the mechanisms adopted by them to manage such stress when making “high-involvement” product purchases. Insights gained from the study would be beneficial for developing efficacious support programs for vulnerable populations. Design/methodology/approach In-depth interviews were conducted with 25 bottom-of-the-pyramid individuals living in slums and housing schemes located in and around Colombo, the capital city of Sri Lanka. Findings Two sources of perceived stress and five coping strategies were derived from the thematic analysis of the data. Participants highlighted the sources of their perceived stress as possible loss of resources and possible loss of self-esteem. Further, the participants were found to adopt several mechanisms to cope with the state of their stress and vulnerability experienced within English-dominant shopping environments, namely, seeking help from salespeople, continuing to shop at the same store, shopping with companions, “convenience purchasing” and buying only well-known brands. Originality/value These insights into the vulnerability, stress and coping mechanisms as experienced by functionally illiterate consumers will allow for the design of efficacious interventions to empower vulnerable populations.