paraphrase The economic costs of waiting lines include the costs associated with clients waiting for service and costs associated with capacity. When low service level is experienced in waiting lines, clients may be dissatisfied with the experience and choose not to return. Low level service may seem to be cheap in the short run but might acquire high expenses of customer discontent for instance loss of future business and definite processing expenses of grievances. The capacity costs are those incurred in maintaining the capacity to offer services. These costs may be measured by population statistics or the average number of clients visiting the business. Other measures include the system utilization rate or the percentage of time that the servers are busy. The decision criteria to justify expanding services to reduce waiting times is to improve the sales and overall profit by enhancing customer experience. Client wait times is one factor that highly influences clients' experiences in a business to a point that it may ruin all business efforts to supply a product or service. The psychology of queuing has some fascinating impacts on the overall client experience