Economics 2005 Jamb Examination

The petroleum industry plays a dominant role in Nigeria’s economy. While it does create jobs and provide corporate revenues, its most significant contribution is the massive income it generates for the government through royalties, taxes, and foreign exchange earnings.

Oil revenue accounts for the majority of government income and export earnings, shaping fiscal and development policies. 

When disputes arise between labor and management, unions rely on their ability to pressure employers by limiting output. One major tactic is "work-to-rule," where workers perform only the minimum requirements of their contracts, slowing productivity significantly.

This form of industrial action strengthens bargaining power since it disrupts production without breaking the law. Therefore, option A is the correct answer.

In Nigeria, industries tend to concentrate in areas where raw materials are readily available. This reduces transportation costs, ensures steady supply of inputs, and allows firms to maximize efficiency. Examples include cement industries near limestone deposits and breweries close to sorghum production areas.

Although market size and external economies matter, raw materials remain the primary factor influencing industrial localization. Hence, option C is correct.

Let b = birth rate d = death rate, g = growth rate\[ g=b-d \;\Rightarrow\; b=g+d\]\[ b=12\%+52\%=64\%\]\[ \boxed{64\%}\]

Backward linkages occur when an industry stimulates the growth of supporting or subsidiary industries that supply it with inputs. In agriculture, this means creating industries such as fertilizer plants, farm equipment factories, and seed companies to support farming activities.

These subsidiary industries enhance agricultural productivity by ensuring reliable supply of inputs. Therefore, the correct option is D.

Onshore and offshore operations in oil exploration are classified based on where drilling takes place. Onshore operations occur on land, while offshore operations are carried out beneath the seabed.

Although differences in production size, output, or techniques may exist, the fundamental distinction is the location of the exploration site. Thus, option A is correct.

In the long run, all factors of production are variable. The concept used to describe changes in output as inputs increase is called "returns to scale."

This differs from the law of diminishing returns, which applies in the short run when at least one factor is fixed. Hence, option B is correct.

In cost theory, the point of break-even occurs when total cost equals total revenue. Graphically, this is associated with the lowest point on the average cost (AC) curve.

The marginal cost (MC) curve always cuts the AC curve at its minimum point. Therefore, for break-even in the long run, the MC must intersect the AC at its lowest point. Hence, option C is correct.

Quantity supplied refers to the specific amount a producer is willing to supply at a given price. When supply increases due to a change in price (and no other factor), it is shown as a movement along the supply curve.

Shifts in the supply curve occur only when factors other than price (like technology or input costs) change. Thus, option C is correct.

In the long run, all factors of production are variable, meaning firms can adjust the scale of operations. A key example of a long-run cost is the planned size of plant and equipment, since firms can expand or reduce capacity.

Fuel, maintenance, and rent are short-run fixed or variable costs, not long-run planning costs. Therefore, option B is correct.