Final answer:
The weakness of group decision-making is that it can be more time-consuming due to increased transaction costs and coordination issues.
Step-by-step explanation:
A weakness of group decision-making is that making the decision will be more time consuming. When a group is involved, transaction costs, which include the time, effort, and resources needed to reach a consensus, increase. Coordination challenges arise when group members agree on overall goals but differ on specifics, leading to potential delays as they work through these issues. Groupthink and group polarization can further complicate decision-making, emphasizing the need for strategies to manage these phenomena, such as seeking outside opinions and withholding leaders' views until all group members have spoken.