(a) How important is rent from extraction of renewable and non-renewable resources to distinguish between Net Domestic Product…

(a) Resource rents, NDP and environmentally adjusted domestic product

Net domestic product (NDP) deducts only the depreciation of produced capital from GDP. It counts the sale of oil, minerals, timber or fish as income even if the natural stock falls. Environmentally adjusted domestic product (EDP) deducts in addition the depletion of natural capital: EDP = NDP − value of resource depletion (and degradation).

The link with rent. Resource rent is the surplus of price over extraction cost, including a normal return to the capital employed. It is the value of the resource in the ground and the measure used to price depletion. In the net price method, depletion = rent per unit × quantity of stock depleted. For a non-renewable resource, every unit extracted reduces the stock permanently, so the whole rent on extraction, or in El Serafy's method the capital part of it (the user cost), is capital consumption, not income. If the rent is consumed, the nation is eating its wealth, and EDP is lower than NDP; the Hartwick rule says that reinvesting the rents in produced capital keeps consumption sustainable. For renewable resources, depletion arises only when harvest exceeds natural regeneration, so the deduction is rent × (harvest − growth).

Economy with only renewable resources at maximum sustainable yield (MSY). Here harvest equals natural growth, so the stock is constant, net depletion is zero, and no deduction is made. EDP then equals NDP as measured, so the practical distinction vanishes. However, it remains valid as a concept: rent is still earned, degradation of other resources such as water or air pollution would still be deducted, and MSY may not be the economically optimal harvest,, since the maximum economic yield lies at a lower harvest once extraction costs are considered. The distinction thus matters in general but is zero for this case.

(b) Balanced and unbalanced growth as complementary strategies

Balanced growth (Rosenstein-Rodan, Nurkse, Lewis) proposes simultaneous investment in many sectors, a "big push", so that each sector's output creates demand for the others, overcoming the small size of the market, indivisibilities and the vicious circle of poverty. It needs large resources and planning capacity, which poor countries lack.

Unbalanced growth (Hirschman, Streeten) says scarce capital and decision-making ability should be concentrated on leading sectors, whose backward and forward linkages create pressure and incentives for investment elsewhere. Imbalance acts as an inducement, although it can cause bottlenecks and inflation.

They are complementary rather than substitutes. A minimum of balance is needed in infrastructure, agriculture and social overhead capital to prevent bottlenecks; within that framework, selective unbalanced investment in high-linkage industries speeds up growth. The two also differ over time and scale: balanced growth is a long-run goal, and unbalanced growth is the path to reach it. India's planning shows this: the First Plan focussed on agriculture and irrigation, and the Second Plan on heavy industry, while agriculture and infrastructure continued to receive support.

(c) "Income inequality is not a concern as long as per capita income rises"

The claim has some merit. Rising per capita income raises average living standards and has reduced poverty in India and elsewhere; the Kuznets hypothesis suggests that inequality may rise in early growth and fall later; and some inequality provides incentives for effort, saving and entrepreneurship.

But it is unsound as a general statement, for several reasons. The average hides distribution: a rise in per capita income can coexist with stagnant incomes for the poor and most of the gains going to the top. Inequality reduces the poverty-reducing effect of growth, so the same growth lifts fewer people above the poverty line. High inequality in health, education and assets limits the opportunities of the poor, lowers human capital and long-run productivity, in Sen's terms reducing capabilities, and narrows domestic demand. It can also cause social tension, capture of politics by the wealthy and weaker institutions. Evidence shows that high-inequality countries do not always grow faster or in a sustained way. Finally, there is an ethical case, based on fairness, for being concerned with distribution.

Judgement: growth is necessary but not sufficient. Inequality is a concern even when per capita income rises, and policy should seek inclusive growth through education, health, employment and progressive taxation.