Supplementary services. This type of service, generate revenue and profitability to your business, but less than the main service. Value-added services, such as providing training in computer external parties. Value-added services in the hospital. Hair salon These services compared to color. Service, service, service is more than a business, what is it that extra if the service has been developing, has the trust of the customer first. Otherwise, extra service will become the primary and will eventually need to change the type of business.
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