Zero risk bias is a phenomenon in which individuals or groups tend to overestimate the likelihood and severity of rare or unlikely risks while underestimating the benefits or likelihood of more common or likely benefits. This bias can lead to a preference for taking extreme measures to eliminate even small risks, even if the costs of those measures outweigh the potential benefits.

In group decision making, zero risk bias can lead to suboptimal outcomes, as the fear of rare risks can outweigh the potential benefits of a decision. For example, in the context of public policy, zero risk bias can lead to policies that are overly restrictive and costly, without providing commensurate benefits in terms of reducing risk.

Additionally, zero risk bias can lead to group polarization, as individuals or groups tend to become more extreme in their views on risk as they discuss them with like-minded individuals. This can further reinforce the belief that extreme measures are necessary to address even small risks, even if the costs of those measures outweigh the potential benefits.

In the business context, zero risk bias can lead to missed opportunities, as companies may shy away from new products, services, or business models that involve even small risks, even if the potential benefits outweigh the costs. This can limit a company's ability to innovate and adapt to changing market conditions.

Overall, zero risk bias is a common phenomenon that can have significant impacts on group decision making. It is important for individuals and groups to be aware of this bias and to actively work to mitigate its effects by considering the relative costs and benefits of different decisions and by seeking out diverse perspectives on risk.