Majority of the candidates scored high marks in this question as they were able to substitute the price values to determine the Quantity Supplied (Qs) correctly and answered almost accurately other parts of the question. However, few candidates could not graduate the Qs axis in (b) part correctly, others interchanged the Qs with the price axis. Most candidates had difficulty in explaining the relationship between Quantity supplied (Qs) and Price (P) in the function Qs = f (P). On the whole the general performance of candidates in this question was above average.
In order to score good marks in this question, candidates were expected to present their answers as follows:
(a) When p = 1, QS = 14 + 4p
QS = 14 + 4(r) = 18
QS = 18kg
When p = 2, QS = 14 + 4 (2)
QS = 14 + 8 = 22kg
When p = 3, QS = 14 + 4 (3)
QS = 14 + 12 = 26kg
When p = 4, QS = 14 + 4 (4)
QS = 14 + 16 = 30kg
When p = 5, QS = 14 + 4 (5)
QS = 14 + 20 = 34kg
When p = 6, QS = 14 + 4 (6)
QS = 14 + 24 = 38kg
(b)
(c) A direct relationship
OR
The higher the price, the higher the quantity supplied.
OR
The lower the price the lower the quantity supplied.
(d) (i)Change in the cost of production – (change in input prices)
(ii) Technical progress.
(iii) Weather/climate condition.
(iv) Changes in the number of producers.
(v) Changes in the prices of other commodities.
(vi) Time.
(vii) Government policy – taxation/subsidies.
(viii) Pests/Natural disasters.
(ix) Availability of co-operant inputs.
(x) Availability and cost of storage facilities.
(xi) Availability of irrigation facilities.
