निष्क्राम्यं प्रवेश्यं च शुल्कम् ॥ कZ_०२.२२.०२ ॥
niṣkrāmyaṃ praveśyaṃ ca śulkam
Customs duty applies both to exports (goods going out) and imports (goods coming in).
To create a comprehensive customs net: revenue capture, monitoring of strategic goods, and leverage over trade flows in both directions.