G.1 The variety of urban environments

The question tests knowledge of the settlement hierarchy and requires matching both population size and service range to the correct tier, not population size alone.

The settlement hierarchy places towns in the range of roughly 3,000–50,000 people. A population of 42,000 falls within this band. A city typically has 50,000–1 million people and functions such as universities and large hospitals serving a regional catchment.

Secondary schools, a district hospital, a supermarket, and local transport are mid-order functions characteristic of a town. The absence of a university, international airport, or stock exchange rules out city or megacity classification.

Both population (42,000) and function range (mid-order services only) align with the town tier, confirming that 'Town' is the correct classification.

The question asks which settlement hierarchy tier best fits a settlement with a given population and set of services.

'Megacity, because its population exceeds the threshold for global significance' is incorrect. Megacities require populations of 10 million or more; 42,000 falls far below this threshold.

'Village, because it lacks a university and international transport links' is incorrect. The absence of higher-order functions is expected at many levels of the hierarchy; 42,000 people and a hospital far exceed what a village offers.

'City, because it has a hospital and secondary schools serving a wide region' is incorrect. Cities typically exceed 50,000 people and offer higher-order services such as universities and specialized hospitals; this settlement's population and functions fall short of that threshold.

By elimination, 'Town, because its population and range of services match that tier rather than city or megacity' is correct, as both the population (42,000) and the mid-order service range correspond to the town tier.

The question tests understanding of why the CBD forms where it does, specifically the relationship between accessibility, land values, and the ability of retailers to pay high rents.

Transport routes converge at the historic core of most cities, creating the point of maximum accessibility — the location reachable by the greatest number of potential customers. This drives up demand for land there, and therefore land values and rents.

Retailers and offices generate high revenue per unit of floor space and depend on footfall. They can afford to pay the peak rent at the most accessible location, which is why the CBD concentrates commercial activity at the centre rather than the periphery.

'The convergence of transport routes at the city centre maximises accessibility, enabling retailers to pay the highest rents there' correctly captures the full causal chain: transport convergence → accessibility → high land values → CBD formation.

The question asks for the best explanation of why the CBD forms at the city centre rather than elsewhere.

'The city centre has the lowest land values, making it affordable for businesses' is factually incorrect — the CBD typically has the highest land values in an urban area, precisely because of the competition for accessible central locations.

'Zoning laws prevent all retail activity from locating anywhere other than the historic core' overstates zoning's role. Zoning reinforces but does not create the CBD; the underlying economic logic of accessibility exists before and independently of planning regulation.

'Industrial activity historically clustered in city centres, attracting commercial functions' is incorrect. Industrial activity typically locates on the urban periphery near transport routes and away from the high-value centre, not in the CBD.

'The convergence of transport routes at the city centre maximises accessibility, enabling retailers to pay the highest rents there' is the only option that correctly identifies the mechanism linking transport, accessibility, and commercial concentration.