Additive Bias

Additive bias is the tendency to look for improvement by adding more rather than subtracting, narrowing, or stopping. In We almost had a smartphone in the 90s. Why did it fail?, David Epstein uses the idea to explain why people and organizations may want more time, money, freedom, features, and resources even when those additions make work worse.

For the wiki’s product branch, additive bias explains why Feature Creep can feel natural. A team may experience every new feature or partner as progress while the product becomes less coherent for the customer.

Key Claims

• Addition can feel safer than choosing what to cut.
• The bias is especially costly when a product lacks Clear Customer Definition.
• Useful constraints can counter additive bias by forcing explicit tradeoffs.
• The pattern complements Desirable Difficulty: the difficulty of giving something up can produce a better route.

Connections

• David Epstein, General Magic, and Sony Magic Link - source context.
• Feature Creep, Clear Customer Definition, and Constraint-Driven Product Discipline - product-management links.
• Design Under Constraints and Desirable Difficulty - adjacent creativity and constraint concepts.