PurposeThe main purpose of this paper is to establish whether trust plays a significant mediating role in the relationship between access to microcredit and survival of young women microenterprises in under-developed financial markets in sub-Saharan Africa. The main focus of this paper is to specifically test whether relational social capital built by young women from homogeneous and heterogeneous groups can be more effective in promoting economic exchange in under-developed financial markets since interpersonal trust has recently been found to harbor group collusion, especially among kins. Overall, the paper distinguishes trust among individuals based on their age, gender and ethnic diversity.Design/methodology/approachThis study used structural equation model to test whether trust significantly mediates the relationship between access to microcredit and survival of young women microenterprises using Analysis of Moments Structures (AMOS) based on recommendations by Hair et al. (2022) and Baron and Kenny (1986).FindingsThe findings from this study revealed that trust significantly and positively mediate the relationship between access to microcredit and survival of young women microenterprises in under-developed financial markets in sub-Saharan Africa. Trust developed from relational social capital among young women from homogeneous and heterogeneous groups create a stronger basis for economic exchange in under-developed financial markets.Research limitations/implicationsWhile this study generates a positive evidence on the impact of access to microcredit on survival of young women microenterprises, the results cannot be over emphasized and generalized because the data were collected from only a single developing country. Future research may extend the current study to include other developing countries to make a more justified comprehensive analysis.Practical implicationsThe findings from this study highlights the importance of using a blend of social policy guided by norms combined with formal regulations as an informal contract enforcement mechanism to achieve efficient economic exchange in under-developed financial markets. Relational social capital formed on the basis of informal norms among groups from diverse population can supplement formal laws to enforce contractual obligations in microcredit access, especially among youthful microentrepreneurs, who seems to have stronger relational behaviors than adults. Financial institutions such as banks should use informal contract enforcement system to increase the scope of financial inclusion of young microentrepreneurs, especially in unbanked rural communities in sub-Saharan Africa, Uganda inclusive where formal laws are weak and sometimes not functional. The findings also show that younger people have a stronger relationship behavior than adults. Therefore, policy should create structures that can promote social activities among youth. Governments in sub-Saharan Africa, Uganda inclusive through their respective Ministry of Gender, Labour and Youth Affairs should create youth clubs that can increase interaction and relational social capital among the younger population to derive economic empowerment. sub-Saharan African governments, Uganda inclusive should rely more on social policy based on relational social capital as a missing link to promote and achieve economic development.Originality/valueThis paper provides an evidence on the unique role of age, gender and ethnicity in information sharing and exchange based on social policy in the financial market to limit group collusion. The authors indicate that diversity in relational social capital among young women microentrepreneurs prohibit strategic defaults, which promotes access to microcredit for survival of women micro small and medium enterprises (MSMEs) through socialization. High level of interaction among younger women microentrepreneurs from homogeneous and heterogeneous groups allow them to close the information gap to timely meet borrowing contractual obligations to derive economic benefits. The paper shows that younger women have more trust than older women while searching for economic value through socialization. In fact, social policy can wholly supplement formal policy to promote growth and survival of young women microenterprises, especially in sub-Saharan Africa, Uganda inclusive.