दिवसानुवृत्तो नित्यः ॥ कZ_०२.६.२४ ॥
divasānuvṛtto nityaḥ
जो दिन-प्रतिदिन चलता रहे, वही नित्य (आवर्ती) आय है।
It provides a simple operational test for classifying receipts as routine cashflow versus periodic or exceptional receipts.