काकणीद्वयं चास्य पलवेतनम् ॥ कZ_०४.१.४२ ॥
kākaṇīdvayaṃ cāsya palavetanam
Et son salaire pour le travail mesuré en palā est de deux kākaṇī.
Different materials/processes can require more labor, fuel, time, or expertise; a published differential fee reduces discretionary overcharging.