Concept:The cardinal approach treats utility as measurable and directly dependent on the quantity consumed.
Explanation:The cardinalist school assumes that satisfaction can be assigned numerical values.
It states that total utility is a function of the quantity of a commodity consumed.
This can be written as
TU=f(Q).
Thus, as consumption increases, total utility changes according to the quantity taken.
Options A and B are assumptions of the ordinal approach, not the cardinal approach.
Option D is incorrect because cardinal utility assumes a constant, not unstable, marginal utility of money.
Answer:C. that total utility depends on the quantity of the commodities consumed.