If 100 units and 120 units of commodity X are supplied at N80 at different times, it means that there is

A major determinant of the demand for a luxury goods is

If income rises from N2000 to N4000 and quantity demanded increase from 80 units to 120 units, find the income elasticity of demand

If the demand elasticity coefficient of cars is 0.5, it implies that the demand for petrol is

As long as marginal utility is positive, total utility must be