Narcissists believe their personality and appearance is superior to others. Symptoms of narcissism include focusing only on one's self, lacking guilt and an inability to empathize. Narcissistic people tend to be vain. A marriage being undermined by narcissism might benefit from therapy.
Trocar: A sharply pointed shaft, usually with a three-sided point. A trocar may be used within a cannula, a hollow tube, designed to be inserted into a vein, artery, bone marrow or body cavity. The word trocar is derived from the French trois (three) + carre (side). Last Editorial Review: 6/9/2016.
marginal revenue is calculated with the difference Marginal Revenue 1 TR Q TR Q Since this is a difference, it corresponds to a change in revenue. The production levels Q and Q 1 differ by one units, so TR Q TR Q 1 describes the change in total revenue when production is changed by one unit. The marginal revenue can also be interpreted as an average rate of change. Using the