काकणीद्वयं चास्य पलवेतनम् ॥ कZ_०४.१.४२ ॥
kākaṇīdvayaṃ cāsya palavetanam
इसके पल-परिमाण वाले काम का मेहनताना दो काकणी है।
Different materials/processes can require more labor, fuel, time, or expertise; a published differential fee reduces discretionary overcharging.