The 13 competitive factors that affect each company's branded footwear sales volumes and market shares in each of the four geographic market regions do NOT include which one of the following?

a. Mail-in rebate offers

b. The appeal of the celebrities that have agreed to endorse a company's brand

c. The average retail prices companies are charging for their branded footwear models in each region's Internet Segment

d. The numbers of retail outlets in each geographic region that stock a company's footwear models/styles and promote its brand with shoppers

e. The average number of new performance features that companies build into their new footwear models at the beginning of each new calendar year