An audio commentary is an additional audio track, usually digital, consisting of a lecture or comments by one or more speakers, that plays in real time with a video. Commentaries can be serious or entertaining in nature, and can add information which otherwise would not be disclosed to audience members.[1]
In accounting terms, operating expenses, or OE, and cost of goods sold, or COGS, are both considered expense accounts. In short, they measure different ways in which resources are spent in the process of running a business.
These costs are expensed when the goods are sold. Period costs are expensed in the period in which they are incurred. This tutorial discusses two approaches to calculating product costs: (1) absorption costing and (2) variable costing. Costs which are treated as product costs are different under the two approaches.