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2007 WAEC Economics Theory Oranges Total Utility Mangoes Total Utility  1 100 1 50 2 190 2 95 3...

Economics
WAEC 2007

Oranges Total Utility Mangoes Total Utility 
1 100 1 50
2 190 2 95
3 270 3 135
4 340 4 170
5 400 5 200
6 450 6 225
7 490 7 245
8 520 8 260

The table above shows Mr. Y's schedule of total utility for oranges and mangoes. The prices of oranges and mangoes are at $1.00 each. Mr. Y has $10 00 to spend on the goods.
Use the information contained in thetable to answer the questions that follow
(a) Calculate the marginal utility for all the levels of consumption for the goods.
(b) At equilibrium, how many (i) oranges (ii) mangoes, will the consumer buy? 
(c) (i)State the law of diminishing marginal utility. (ii) State the marginal condition for utility maximization.

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Explanation

(a)

Oranges Total Utility Marginal Utility Mangoes Total Utility  Marginal Utility 
1 100 100-0 = 100 1 50 50 - 0 = 50
2 190 190 - 100 = 90 2 95 95 - 50 = 45
3 270 270 - 190 = 80 3 135 135 - 95 = 40
4 340 340 - 270 = 70 4 170 170 - 135 = 35
5 400 400 - 340 = 60 5 200 200 - 170 = 30
6 450 450  - 400 = 50 6 225 225 - 200 = 25
7 490 490 - 450 = 40 7 245 245 - 225 = 20
8 520 520 - 490 = 30 8 260 260 - 245 = 15

MUn = TUn -Tu or MU = \(\frac{\DeltaTU}{\DeltaQ}\

(b)(i) 7 oranges, (ii) 3 mangoes
(c) (i) As a consumer consumes successive units of a commodity, a point is eventually reached where consumption of an additional unit yields less satisfaction.
     (ii)  \(\frac{MUo}{Po}\) =  \(\frac{MUm}{Pm}\)
           Where O = Oranges
                       m = Mangoes
                       mu = Marginal Utility
                       P = Price
OR \(\frac{Muo}{Mum}\) =  \(\frac{Po}{Pm}\) OR Muo = Po ffor single good.


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