दिवसानुवृत्तो नित्यः ॥ कZ_०२.६.२४ ॥
divasānuvṛtto nityaḥ
जो दिवसेंदिवस चालू राहतो, तो नित्य (आवर्ती) आय होय.
It provides a simple operational test for classifying receipts as routine cashflow versus periodic or exceptional receipts.