अमुद्राणामत्ययो देयद्विगुणः ॥ कZ_०२.२१.०३ ॥
amudrāṇām atyayo deyadviguṇaḥ
अमुद्रितानां पण्यानाम् अपराधे देयद्विगुणो दण्डो भवेत्।
It makes evasion economically irrational by making the expected cost exceed the avoided duty, while still being administratively simple to compute.