सस्यवर्णानामर्घान्तरेण विनिमयः परिवर्तकः ॥ कZ_०२.१५.०५ ॥
sasyavarṇānām arghāntareṇa vinimayaḥ parivartakaḥ
“Parivartaka” is the exchange of one kind of grain for another, taking account of differences in valuation/price.
It allows the state to substitute commodities for logistics needs while keeping accounts fair, preventing hidden losses through unequal barter.