The WTO also requires that FTA signatories include substantially all trade and substantially all sectors in their agreement. However, there is as yet no specific rule on what percentage constitutes "substantially all." Instead, that percentage is determined by the signatories.
此外，依據 WTO 規範，要簽 FTA 的雙方，既然要自由化，那麼涵蓋的貨品貿易或服務貿易範圍就要足夠全面且「具代表性」；至於多少比重才算「具代表性」，並未具體規定，是經由雙方共同認定。