Marginal revenue is the 1. change in product price associated with the sale of one more unit of output. 2. change in average revenue associated with the sale of one more unit of output. 3. difference between product price and average total cost. 4. change in total revenue associated with the sale of one more unit of output.

Indicate whether each of the following companies is primarily a service, merchandise, or manufacturing business. if you are unfamiliar with the company, use the internet to locate the company's home page or use the finance web site of yahoo. 1. alcoa inc. 2. boeing 3. caterpillar 4. citigroup inc. 5. cvs 6. dow chemical company 7. ebay inc. 8. fedex 9. ford motor company 10. gap inc. 11. h& r block 12. hilton hospitality, inc. 13. procter & gamble 14. suntrust 15. walmart stores, inc.