price, value
價 centers on the worth of something expressed in exchange: its price or value.
價 is the traditional form of 価. It combines 亻 (person) with 賈, which likely contributes the sound and relates to buying and selling, giving the idea of a person's valuation or price.
A person 亻 beside 賈 (a shape associated with merchants and goods) suggests a person setting a price or value on something.
For カ, imagine a person pricing a car: car -> カ, and the person 亻 is setting its value.