Group Concession Scheme under New Pricing Scheme implemented w. e. f. April, 2003 Under NPS, all manufacturing units were characterized into six group based on vintage and the feed-stock. For each group, weighted average group price was worked out barring the outlier (RPS more than +/ - 20% of group average). Every manufacturing unit will get the concession rate dependent on the group average or the retention price, whichever is lower. Outlier manufacturing units to get benefit of 50 percent of the difference between the RPS and the group average for a time of three years.