Hello aspirant ,

It seems you are willing to do Phd only of a good job is secured. A Phd degree holder is such a person who as the ability to bring solutions to the related problems since existing mattner is known to them from all angles.

So whatever career you choose should be of your own interests, apptitude and match your abilities. There is nothing like value of Phd in commerce.There are numerous problematic situations in Commerce and it's surrounding area for which you can have a thorough research,device a solution and you can get your Phd degree.

So it depends on your abilities. 

All the best!!