Summary
Highlights
Anchoring bias is when people heavily rely on the first piece of information received, no matter its reliability, to make subsequent decisions. For example, the initial price quoted for a car heavily influences perceptions of later price adjustments.
This bias causes people to overestimate the importance of easily available information. News coverage, for instance, can inflate the perceived danger of terrorism compared to statistically more common threats like falling televisions or coconuts.
The bandwagon effect describes people adopting beliefs or behaviors because the majority does, rather than from their own conviction. This can be seen in elections, stock market trends, or group meetings where individuals conform to the group consensus.
People exhibit choice-supportive bias by defending their past decisions to maintain self-esteem, often ignoring the downsides of their chosen option while highlighting those of alternatives. For example, an Apple user might overlook flaws in their MacBook while critiquing PCs.
Confirmation bias is the tendency to seek out and interpret information that confirms existing beliefs. Someone believing sweets are unhealthy will actively search for articles supporting this view, ignoring contradictory information. This bias is particularly dangerous in scientific contexts.
Ostrich bias is the subconscious decision to ignore negative information, or to only consider positive aspects. This can manifest as procrastination when facing an undesirable task or smokers ignoring negative health implications of cigarettes. It promotes ignorance by avoiding truth.
Outcome bias involves judging the quality of a decision based solely on its outcome, rather than the initial conditions or decision-making process. A manager's gut decision that turns out right might be seen as superior to data-driven advice, even if the good outcome was just luck, leading to poor long-term logical thinking.
Overconfidence occurs when past successes lead to reliance on personal judgment and opinion over facts. A successful stock trader might become overconfident, believing any stock they choose will be profitable, disregarding analytical data, similar to the gambler's fallacy.
The placebo effect demonstrates that believing something will have a certain effect can actually cause that effect to occur, even if the intervention is inert. This highlights the powerful role of mindset in recovery and achievement, and can be harnessed for personal advantage. A reverse effect, the 'nocebo effect', is also noted.
Survivorship bias occurs when judgments are based only on 'surviving' information, ignoring failures. Articles about millionaires' habits typically focus on those who succeeded, overlooking equally engaged individuals who didn't. Similarly, observing ancient, well-preserved buildings neglects the thousands that have long since crumbled.
Selective perception is a bias where people interpret messages and actions through their existing frame of reference, often overlooking information that contradicts their beliefs or expectations. A smoker might ignore anti-smoking ads but readily notice soccer advertisements if they are a fan, as it aligns with their positive perception.
Blind spot bias, or bias bias, is the tendency to believe one is less biased than the average person. For example, a teacher might deny that a gift influenced a student's grade, but readily acknowledge that other teachers could be swayed by similar gifts. This highlights an individual's inability to recognize their own biases.