Dutiyapāpaṇikasutta
“Tīhi, bhikkhave, aṅgehi samannāgato pāpaṇiko nacirasseva mahattaṁ vepullattaṁ pāpuṇāti bhogesu. Katamehi tīhi? Idha, bhikkhave, pāpaṇiko cakkhumā ca hoti vidhuro ca nissayasampanno ca. Kathañca, bhikkhave, pāpaṇiko cakkhumā hoti? Idha, bhikkhave, pāpaṇiko paṇiyaṁ jānāti: ‘idaṁ paṇiyaṁ evaṁ kītaṁ, evaṁ vikkayamānaṁ, ettakaṁ mūlaṁ bhavissati, ettako udayo’ti. Evaṁ kho, bhikkhave, pāpaṇiko cakkhumā hoti.
A Shopkeeper (2nd)
“Mendicants, a shopkeeper who has three factors soon acquires great and abundant wealth. What three? It’s when a shopkeeper sees clearly, is indefatigable, and has supporters. And how does a shopkeeper see clearly? It’s when a shopkeeper knows of a product: ‘This product is bought at this price and is selling at this price. With this much investment, it’ll bring this much profit.’ That’s how a shopkeeper sees clearly.