Which of the following are necessary conditions for third-degree price discrimination to enhance profits. a. There are two different groups with different (and identifiable) elasticities of demand.
b. At least one group has elasticity of demand less than one in absolute value.
c. At least one group has elasticity of demand greater than 1 in absolute value.
d. We are able to prevent resale between the groups.

The advantage of administering personality tests on employees is that it will allow the employer to know the mindset and personality of the employee. this will allow the employer to at least have an idea as to how the employee works and how his attitude in the workplace. the disadvantage is that it may make the employee a little anxious as to whether he would meet the personality requirements of the employer and whether he would be able to retain the job or not. 

Answera reversion;

Answereconomy of purchase;