Emotional Biases in Investment Decision-Making

John is a financial advisor who has been experiencing significant stress due to market volatility. Recently, he has been feeling overly optimistic about certain tech stocks, believing they will rebound strongly despite evidence that suggests otherwise. This optimism has led him to encourage his clients to invest heavily in these stocks, even when they have shown substantial risks.

In the context of behavioral finance, discuss the emotional biases that may be influencing John’s decision-making. Provide specific examples of these biases and analyze how they could impact both his investment recommendations and his clients' investment decisions.