Amazon has decided to enter the college bookstore market. The goal of "Amazon Campus" is to offer co-branded university-specific web sites that offer textbooks and paraphernalia, such as logo sweaters and baseball hats. This development shows Amazon's relentless pursuit of .

answer; i believe both technician (a) and (b) are correct; /// good luck

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.

answer; rapid growth in buyer demand and high buyer switching cost;