The sales manager assigned a target of selling 40 RO Water Purifiers in a month to a group of 10 sales executives. They mutually decided to sell 4 purifiers each. However, after selling 1 purifier, kshitij (one of the sales executive) met with an accident. The other sales executives did not pay any attention to the remainning target of Kshitij and concentrated on their individual sales target. At the end of the month, only 37 purifiers could be sold. Identify the principle of management violated in the given case ?