On average, at each border the removal of controls is equivalent to the removal of a 0.7% tariff, and the cost savings on a trade route increase with the number of internal borders crossed.
Rata-rata, di setiap perbatasan, penghapusan kontrol sama dengan penghapusan tarif senilai 0,7%, di mana penghematan biaya di jalur perdagangan meningkat seiring dengan jumlah perbatasan internal yang telah dilintasi.