自信過剰バイアス

Overconfidence bias is the tendency to overestimate one’s knowledge, abilities, or predictions while ignoring uncertainties or opposing evidence. 

This bias often leads to unwarranted confidence, poor decisions, and misjudgments.

One common form of overconfidence is miscalibration, where individuals make overly precise predictions by setting confidence intervals that are too narrow to account for uncertainty. 

For example, a marketing team might predict with ninety percent confidence that their new advertising campaign will increase sales by ten to fifteen percent.

However, sales increased by only five percent, falling outside their predicted range. 

This demonstrates how overconfidence caused them to underestimate uncertainty, overlooking factors such as market competition or shifting customer preferences. 

Similarly, Alpha Corp, a tech company, launched a product without conducting sufficient market research, assuming they fully understood customer needs. 

Their overconfidence led to the product’s failure and significant financial losses.

Individuals and organizations should actively seek diverse perspectives, critically analyze data, and reassess their assumptions to mitigate overconfidence bias.