The Sunk Cost Fallacy refers to the tendency to continue investing resources (such as time, money, and energy) into a project or investment that is already failing, simply because of the significant costs that have already been incurred, rather than making decisions based on future returns. Root Cause: The root cause of the Sunk Cost Fallacy lies in "loss aversion." People tend to feel reluctant to give up on something they've already invested in, leading to an emotional drive to continue inv...