The psychology behind current bias has been explained by several different principles, including cognitive misunderstanding and psychological commitment. The following explanations are some of the most common explanations. Importantly, all of these explanations are considered to be irrational reasons for preferring the status quo. Studies have shown that when individuals make decisions, they measure the likelihood of loss more than the probability of loss. Therefore, when considering a range of choices, they pay more attention to what they might lose because they give up the status quo rather than what they get by trying new things. The cost of sunk costs refers to the fact that individuals often continue to invest resources (time, money or effort) into specific efforts because they have invested resources in this effort, even if such efforts are not proven to be benefit. The sunk cost causes the individual to continue along a particular direction of action, even if it fails. The sunk cost leads to a bias in the status quo, because the more individual investment is, the more likely he or she is to continue investing in the status quo.