The article aims to analyse corruption in public institutions, focusing on the Grain Marketing Board (GMB) headquarters of Harare in Zimbabwe as a case study. The study argues that corrupt business conducted by public officers has created problems such as administrative inefficiency, a social atmosphere of tension, dishonesty within public institutions and a food security crisis. The research is grounded on the qualitative approach and interviews and document analysis were used as research instruments to collect information. The game theory is the basis for the study. The findings of the research show that the prevalence of corruption in public institutions in Zimbabwe is mainly as a result of a lack of political will to address the challenges primarily because the political elite are mostly beneficiaries of corruption. It was also established that politicisation is widespread in public institutions and corruption occurs in the follo