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Security is a critical problem when implementing Mobile Ad Hoc Networks (MANETs) and is widely acknowledged. This paper describes the effects of selfish nodes in MANETs. An Ad Hoc Network is a collection of wireless mobile hosts forming a temporary network without the aid of any centralized administration or standard support services. One of the different kinds of misbehavior is node selfishness. A selfish node wants to preserve its own resources while using the services of others and consuming their resources, such misbehaving nodes participate in the route discovery and maintenance phase but refuse to forward data packets, which degrades routing performance. One way of preventing selfishness in MANETs is the detection and exclusion mechanism. In this paper, we focus on authenticated scheme, which preserves communication privacy and mitigates selfish nodes in MANETs. The simulation results are presented here that shows the negative effects which selfish nodes causes in MANETs.