(a) What is complementary region ? With reference to hierarchy of settlements, describe the different types of complementary regions as proposed by Christaller. 20

(b) Analyse the spatial changes and emerging patterns of semiconductor manufacturing

Question

(a) What is complementary region ? With reference to hierarchy of settlements, describe the different types of complementary regions as proposed by Christaller. 20

(b) Analyse the spatial changes and emerging patterns of semiconductor manufacturing in the world. 15

(c) "In developed countries, migration rather than fertility will be the main driver of population dynamics over the next few decades." Examine the statement. 15

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Settlement hierarchy and complementary regions. A complementary region is a spatial unit in which settlements of different hierarchical levels provide mutually reinforcing goods and services, so that each central place draws on a hinterland and supplies higher-order functions to lower-order places. In Christaller’s central-place model, settlements are ranked not merely by size but by threshold and range: a market town, district town, regional city and metropolis each command different service ranges. Higher-order places offer more specialised services and larger hinterlands. The model produces nested hexagonal complementary regions under three principles. Under the market principle (K=3), a central place serves one-third of each surrounding lower-order place, giving compact hexagons and per-order settlement counts of 1, 2, 6, 18, 54. Under the transport principle (K=4), lower-order places are shared between two higher-order centres to reduce transport costs, producing elongated hexagons and counts of 1, 3, 12, 48, 192. Under the administrative principle (K=7), each lower-order place is wholly assigned to one higher-order centre, yielding larger, less efficient hexagons and counts of 1, 6, 42, 294, 2058. Together these patterns show functional interdependence: villages depend on towns for markets, towns on cities for specialised services, and cities on metropolitan nodes for high-order functions.

Spatial changes in semiconductor manufacturing. The world semiconductor system has shifted from early Silicon Valley dominance, where design, fabrication and components were concentrated in the United States, to an East Asian manufacturing core. Taiwan, South Korea and China now dominate advanced fabrication, with TSMC and Samsung exemplifying the foundry model: design houses in the US, Europe and Japan outsource manufacturing to specialised foundries. Government industrial policy has accelerated this restructuring: the US CHIPS Act, EU Chips Act, Japan and South Korea subsidies, and China’s state-backed investment have reshaped investment, talent and supply chains. Geopolitical fragmentation is visible in export controls, technology alliances and national champions. The result is a more regionalised and security-driven geography. Reshoring and nearshoring are creating new clusters in the US, Europe and Japan, while mature-node production remains concentrated in East Asia and Southeast Asia. India is emerging as an assembly, testing and packaging node under the Semiconductor Mission and PLI for IT hardware, though advanced fabrication remains limited. Its role is likely to strengthen through fab investments and electronics manufacturing, though dependence on imported wafers and advanced equipment remains.

Migration and population dynamics. In developed countries, fertility is largely below replacement and age structures are ageing, so natural increase is weak or negative. In Japan, South Korea and much of Europe, low fertility and ageing make migration essential for maintaining economic scale. Migration therefore becomes the main driver of population dynamics over the next decades. It affects labour-force growth, especially in low-skill services and high-skill knowledge sectors, and can offset population momentum caused by earlier high fertility. Migration also influences dependency ratios: younger migrants can reduce old-age dependency in the short term, while later ageing of migrant cohorts may increase it. In countries such as Germany, Canada, Australia and the United States, migration is central to sustaining labour supply, pension systems and urban growth. Thus migration operates as a tool of demographic management, not merely a secondary adjustment. The statement is therefore broadly correct, but migration’s impact depends on policy, skill mix, integration and source-country push factors.

Thus, settlement hierarchy, semiconductor location and demographic change are linked spatial processes: central-place systems organise service flows, semiconductor geography is being reconfigured by policy, foundry specialisation and supply-chain security, and migration is becoming the key demographic force in developed regions. Together they show how regional development is shaped by the interaction of settlement functions, industrial location and population movement.

(a) What is complementary region ? With reference to hierarchy of settlements, describe the different types of complementary…

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