Mahabharata 12.283.3

वाणिज्यं पाशुपाल्यं च तथा शिल्पोपजीवनम्शूद्रस्यापि विधीयन्ते यदा वृत्तिर्न जायते

vāṇijyaṃ pāśupālyaṃ ca tathā śilpopajīvanamśūdrasyāpi vidhīyante yadā vṛttirna jāyate

Our plain-language meaning of this verse is waiting for scholar review.