1.3.18
परिव्यवेभ्यः क्रियः
Operational rule vidhi
When any of the उपसर्गs - परि, वि, अव - is attached to the verb 'क्री', it gets the प्रत्ययाः of आत्मनेपद.
Word by word (padaccheda)
Left context परि- वि- अवेभ्यः pañcamī · bahuvacanaLeft context क्रियः pañcamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
परि-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After the verb क्री 'to purchase', when preceded by परि , वि or अव , the आत्मनेपद affix is employed, even when the fruit of the action does not accrue to the agent.
The verb डुक्रीञ् 'to buy or barter,' has an indicatory ञ् and therefore, by sutra 1.3.72 it will be Atmanepadi when the fruit of the action accrues to the agent. The present sutra, therefore, refers to cases where the fruit of the action does not accrue to the agent.
The root क्री 'to buy' as a general rule takes the terminations of both padas, but when it is preceded by pari, vi, or ava, it is restricted to Atmanepada terminations. As प्ररीक्रीणीते 'he buys'; विक्रीणीते 'he sells'; अवक्रीणीते 'he buys.'
The word pari, vi, and ava must be upasargas, therefore, in the following example, there is no Atmanepada termination, because the vi there is not a preposition but a noun, as, बहुविक्रीणाति वनम्.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.