Zero-risk bias means that when people are faced with a choice that has some risk involved, they often choose the option with no risk at all. For example, let's say you're deciding which type of investment you want to make. You can either choose an investment with no risk (like putting your money in a savings account) or you can choose an investment with some risk (like investing in stocks or bonds). Most people will usually pick the option with no risk, even though the one with some risk might potentially earn them more money in the long run. It's because people don't want to take any chances and want to be sure their money is safe. So, when faced with a decision like this, people tend to go with the option that has no risk.