To prevent isolation, comp set changes must be made by a net change of:

In the context of competitive set (comp set) adjustments for hotels, making changes is critical to ensuring a property's market performance and positioning within the industry. The correct answer involves a net change of two or more properties. This is important because a change of one property may not significantly impact the competitiveness of the set; it could lead to isolation of a property’s performance data, making it difficult to accurately assess its market position.

When changing the competitive set, adjusting by two or more properties helps to ensure a balanced view of the market landscape. It allows for a more robust comparison that can effectively reflect market trends, competitive dynamics, and customer preferences. This strengthens the validity of the performance metrics derived from the comp set, leading to better strategic decisions.

Making changes with fewer than two properties can skew the data and lead to misleading conclusions about a hotel's market performance, undermining strategic initiatives. Thus, the requirement of a net change of two or more properties is essential for maintaining relevant and effective competitive benchmarking.