How does an increase in income lead to the development of industries​

The beginning inventory is expected to be 2,000 cases. expected sales are 10,000 cases, and the company wishes to begin the next period with an inventory of 1,000 cases. the number of cases the company must purchase during the month is multiple choice 9,000 cases. 10,000 cases. 11,000 cases. 13,000 cases.

Specialization—the division of labor—enhances productivity and efficiency by a) allowing workers to take advantage of existing differences in their abilities and skills. b) avoiding the time loss involved in shifting from one production task to another. c) allowing workers to develop skills by working on one, or a limited number, of tasks. d)all of the means identified in the other answers.

Which ranks these careers that employers are most likely to hire from the least to the greatest?