The debate is usually based on the issue of intrinsic versus extrinsic motivation- i.e extrinsic rewards such as tokens, money, privileges etc have not been proven to be effective in the long run. These can lose their value if overused. Research tells us that it is more important to develop the intrinsic motivation. Behaviors will be more long-lasting if they are developed based on wanting to be good or do well for its own sake rather than for some external reward.
