Where does expert power come from?

Leaders often must rely on experts in their decision-making process, but they cannot always count on receiving unbiased advice. Steven Callander, Nicolas Lambert, and Niko Matouschek write that decision-makers do not have to avoid experts but must understand where their power comes from. They find that expert power comes not from their recommendations, but from the extra information they provide, which changes what decision-makers believe about the other options available.