| a) | $MRS \times Y$ | 1) | TU-(P xx Q) |
| b) | $e_p$ | 2) | $\frac{\Delta Y }{\Delta X }$ |
| c) | Consumer's surplus | 3) | $\frac{ MU _{ A }}{ P _{ A }}=\frac{ MU _{ O }}{ P _{ O }}$ |
| d) | K | 4) | $\frac{\Delta Q }{\Delta P } \times \frac{ P }{ Q }$ |
- A4 3 2 1
- B) 2 1 4 3
- C3 4 2 1
- ✓3 1 4 2
Answer: D.
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