Abstract
Management accountants have recently migrated toward a business partner role, and as a result they often assist management with the decision-making process. Thus, it is imperative that they excel at identification of relevant information such as opportunity costs. This study experimentally tests the prediction that management accounting experience mitigates the tendency to ignore opportunity costs with respect to two factors: opportunity cost vagueness and project completion stage. This study also investigates whether attending to opportunity costs has an impact on project continuance decisions. Results indicate that management accounting experience mitigates the effect of vague opportunity costs and project completion stage. It was also found that attention to opportunity costs acts as mediator and this in turn reduces the tendency to continue an existing project. This suggests that attending to opportunity costs influences decision-making and that it is likely to have an economic consequence.