Your question is so important, as this pervasive challenge has broad-reaching implications, both psychological and economic. I saw your question earlier today and it prompted me to write a hub I've been wanting to write ("How to Get Motivated For Real"). Tamara Lowe wrote a best-selling book, "Get Motivated!" and it answers your question with detailed information that teaches us how to determine what our own, and others' motivational DNA actuallly is. By understanding factors which both motivate and de-motivate us, and others, we can employ & apply the six motivators that actually work for each person. We are primarily driven by Connection or Production; have a predominant need for either Stability or Variety; and seek to be rewarded by either Internal or External awards. By knowing and applying the right combination of personal motivators for someone we can inspire and motivate them. She has developed a unique and brilliantly accurate questionaire. Hope this helps.