Escalation of commitment refers to a pattern of behavior in which an individual or group will continue to rationalize their decisions, actions, and investments when faced with increasingly negative outcomes rather than alter their course. The related term sunk cost fallacy has been used by economists and behavioral scientists to describe the phenomenon where people justify increased investment of money, time, lives, etc. in a decision, based on the cumulative prior investment ("sunk costs"), despite new evidence suggesting that the cost, starting today, of continuing the decision outweighs the expected benefit. These decisions are irrational in their current context but in alignment with decisions and actions previously made, and they can be influenced by a variety of determinants and contexts. The dilemmas leading up to such decisions usually involve the prior choices no longer working or causing personal or group losses. While there are options to either cease current actions or continue on with them, neither has clear outcomes or is the obvious choice. Escalation of commitment then occurs when persistence is chosen over withdrawal.