Internal motivation is the motivation, which driving force is not external impact (incentives, reinforcers) but something within the person. This motivation is not related to the external curcumstances, but to the content of an activity itself.
Internal motivated behaviour occurs in the absence of any explicit external reward.
Internal motivation in business
Internal motivation in business is based on independence, professionalism and focus on results.
Independence - the ability to direct your own life for those who want to manage their own lives. The ability to do whatever you want to do right now. For performance you need management, for independence - self-regulation.
Professionalism - the desire to become the best in your business.
Focus on results - the desire to do your job in the name of something greater than you are.