At the time of the case (2001-02), the cell phone industry is known for very high customer dissatisfaction. Despite most carriers locking customers in with contracts, the big carriers churn a large percentage of customers each year. Clearly, customers are frustrated and are not loyal to their carrier. What are the sources of this dissatisfaction

price levels and price structure

Explanation:

A mobile carrier may be defined as the wireless service provider which supplies the cellular connectivity services to the mobile phone as well as the tablet subscribers. IN other words it is the wireless carrier of the mobile. The cell phone users pay for the usage of the mobile carrier to the mobile company.

But in the 2001-2002, there has been a very high dissatisfaction of the customer of the mobile company.  Despite most of the carriers locking their customers with the contracts, the big carriers of mobile operator churn a very large percentage of these customers each year. Most of the carriers tries to hold their customers as "hostages" through the contracts and they feel they are trapped in the plans.

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; niosh, the national institute for occupational safety and health;