(a) Explain with suitable diagrams A. Losch's model of the Theory of Location related to Central Places. Why has this been…

(a) Lösch's model of central places and its criticism

August Lösch (1940) built his theory from the economics of a single producer, in contrast to Christaller, who began with the settlement hierarchy.

(i) Assumptions. A uniform plain with evenly spread farms, equal transport in all directions and identical tastes and costs. Each producer has a demand cone: as price rises with distance, sales fall to zero at a range limit. Competition among producers then packs the market areas into hexagons, which leave no area unserved and keep the areas as round as possible.

(ii) Nets of hexagons. Different goods have different ranges, so each has its own net, with a different number of market areas for each: K = 3, 4, 7, 9, 12, 13 and so on. Christaller's fixed K = 3, 4 and 7 are only special cases.

(iii) Rotation. The nets are laid over each other about a single metropolis, and rotated so that as many centres as possible coincide. This gives six sectors rich in centres (city-rich) and six sectors poor in centres (city-poor), alternating about the metropolis, with a spread of centre sizes from the smallest to the largest instead of a neat hierarchy.

(iv) Result. The landscape has a series of overlapping market areas, and the sum of transport movements is at a minimum.

Criticism. The homogeneous plain, equal income, and uniform costs are unrealistic. The model is static and geometric, ignores relief, transport networks, history, and agglomeration, assumes perfect competition, and is hard to test. It predicts no fixed hierarchy, so it is less useful for planning than Christaller's, and its complexity limited its application.

(b) Sustainable land management and the three goals

SLM is the use of land, water, soil and vegetation so as to meet present needs without reducing the capacity of the land for the future. It is promoted by the UNCCD and SDG 15.3 on land degradation neutrality.

(i) Environmental. Contour bunding, check dams, afforestation, agroforestry and watershed management reduce soil erosion, recharge groundwater and restore vegetation and biodiversity.

(ii) Economic. Conservation practices raise and stabilise yields, add fodder, horticulture and livestock, and open market linkages, so that conservation pays and risk falls.

(iii) Social. Community participation, secure tenure and equitable sharing of benefits give livelihoods, reduce distress migration and build local institutions.

(iv) Examples. At Sukhomajri in Haryana, village-managed check dams and grazing control cut siltation of the Sukhna Lake, raised yields and incomes. The Tarun Bharat Sangh's johads in Alwar, Rajasthan, revived groundwater and rivers. The Forest Rights Act, 2006, recognises the rights of forest dwellers, which gives them a stake in conservation.

Sound SLM aligns these so they reinforce one another, though it needs trade-offs, finance, and good governance.

(c) Demographic transition and uneven economic development

The demographic transition describes the passage from high birth and death rates to low ones as a society develops. The stages are unevenly distributed because development is uneven.

(i) Stage 1 and 2. Stage 1 is almost extinct. Many low-income countries, such as Niger, Mali and Chad in the Sahel, are in stage 2: death rates have fallen with health care and vaccination, but fertility stays high at five or more births per woman, so the population grows very fast.

(ii) Stage 3. Countries like India, Bangladesh and Mexico have falling fertility; India's total fertility rate is now about 2.0. Within India, Kerala and Tamil Nadu are far ahead of Bihar and Uttar Pradesh, which reflects regional differences in education, health and income.

(iii) Stage 4 and 5. Developed countries like the United Kingdom and the United States have low, stable rates, and Japan, Germany and Italy have ageing and declining populations.

The link is that education, urbanisation, health and female employment lower fertility, so the richer the economy, the later the stage. But the path is not universal: Iran, Bangladesh and China reduced fertility much faster than Europe did, helped by policy.