(a)[4]
How might the North Sea oil industry influence the UK's national income?
(b)[6]
Using the information provided, decide whether the North Sea oil industry seems to be declining or expanding.
(c)[4]
What evidence is there that could explain why the North Sea oil industry is still willing to increase investment?
(d)[6]
Discuss whether the rise in the number of small firms drilling for oil goes against the usual economic explanation for why small firms exist.