The success of any business depends to a large extent on the quality of the goods and services that it offers. This statement is also true for translation agencies. If you earn a reputation as a reliable supplier that doesn’t cause problems for its clients, you’ll most likely end up with a stream of orders for many years to come, and your clients won’t risk working with any other translation agencies even if they offer lower prices.
When choosing, for example, a carton of orange juice in a store, you want to know how much it costs, and you can find this out by looking at the price tag. But when you ask an agency about the cost of a translation, you are unlikely to receive an immediate quote there and then: most likely, the agency will ask you questions to clarify certain issues.