The positive effects of allowing employees to manage workflow is?

This allows workers to work with less pressure on their job assignments.  It also helps them develop a sense of time management when doing their work.  In some cases, it makes them more creative by giving them a free hand on their approach to doing their work.

yup the answer is

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.