When a company chooses to market a product in certain parts of the country but not in others because consumer preferences of one region differs from another region, it is known as

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. 

You cannot. you can use a walmart gift card to buy any merchandise at walmart store only.