please do it in 10 minutes will upvote

Your manager recently attended a seminar where one of the speakers asked the following question 'for short-term decision making, marginal costing is a far superior technique so why do most companies still use traditional absorption costing when valuing its inventory'. Discuss the above statement and, in doing so, advise your manager on the differences between marginal and absorption costing and why you either agree or disagree with the speaker's statement. [15 marks] [Total 30 marks]