The aggregation problem is a problem in Economics that refers to the issue of how best to aggregate the preferences of individual economic agents into a single decision. This problem arises because individual agents often have different preferences, and these preferences may conflict with each other. As a result, it can be difficult to determine how to aggregate these preferences into a single decision that will be acceptable to all agents. There are a variety of ways to solve the aggregation problem, and each has its own advantages and disadvantages.