The repugnant conclusion is a philosophical notion in utilitarianism that suggests if a large population of people living barely bearable lives can be considered better than a smaller population living very happy lives, then it challenges our intuitions about well-being and value. This idea brings to light the potential implications of utilitarian thought, questioning how happiness and suffering should be weighed when making ethical decisions. The conclusion leads to debates around the moral acceptability of maximizing overall happiness at the cost of individual suffering.