 They are concerned with costs relating to all areas of the law and deal with every conceivable type of legal matter that touches upon the subject of costs.An experienced and competent law costs professional may command a salary on a par with that of a solicitor or legal executive.The unsuccessful litigant is usually ordered to pay the successful litigant’s costs ("inter partes" costs) and, if those costs cannot be agreed, a detailed bill of costs is prepared and served.