Kautilya's Arthashastra 2.6.22

2.6.22

vikriye paṇyānām arghavṛddhir upajā, mānonmānaviśeṣo vyājī, krayasaṃgharṣe vārdhavṛddhiḥ - ity āyaḥ //

The rise in price of merchandise due to the use of different weights and measures in selling is termed vyáji; the enhancement of price due to bidding among buyers is also another source of profit.