The biggest challenge an MNC might face is cultural differences between local and global recruits. This is where HRM needs to get creative and come up with a solution suitable for every individual in the firm so that it is also a "win-win". Once, the cultural barrier (differences in language, customs, traditions, religion, etc.) is solved and a bunch of like-minded, talented, and hard-working people are working to achieve the same goal, then the organization is bound to thrive.