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.
The cost of sales attributed to a company's products or services are expensed as the company sells these goods. As the cost of sales does not include overhead costs, it has a higher proportion of variable cost than the operating costs. Some fixed costs, such as labor costs, might be included in the cost of sales.