Shares of

Borders

(BGP)

were down about 16% for the week despite higher-than-expected earnings as fears of a market share fight with

Barnes & Noble

(BKS) - Get Report

took their toll. Borders, the No. 2 U.S. bookseller, said on Tuesday that it earned 5 cents a share, a penny ahead of the consensus estimate. The company also forecast second-quarter and full-year earnings in line with estimates. The stock still fell, however, as analysts said the company's same store sales were beginning to fall behind those of rival Barnes & Noble.