What is the change in total costs associated with a one-unit change in output?

Which of the following would be classified in a different major section of a balance sheet from the others?

a. Capital stock b. Common stock subscribed c. Stock dividend distributable d. Stock investment in affiliate

Which of the following is not a role of the Web from the vantage point of the retailer?

a. to furnish customer service in the form of E-mail and "hot links" b. to replace mail, phone, and fax communications c. to reach geographically dispersed consumers, including foreign consumers d. to provide information to consumers