3. Consider the consumer's choice problem for two goods which are perfect complements: i.e. where u(x1,1?2) : 111i11{r1,1:2} (a) Derive the consumer's Hicksian demand. (h) Derive the. consumer's expenditure function. (C) Is the expenditure function you derived in part (e) concave in prices? Strictly concave in prices? Explain the intuition behind this result