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The Dual Sector model, or the Lewis model, is a model in developmental economics that explains the growth of a developing economy in terms of a labour transition between two sectors, the subsistence or traditional agricultural sector and the capitalist or modern industrial sector.
The three-sector model adds the government sector to the two-sector model. [17] [18] Thus, the three-sector model includes (1) households, (2) firms, and (3) government. It excludes the financial sector and the foreign sector. The government sector consists of the economic activities of local, state and federal governments.
The Uzawa–Lucas model is an economic model that explains long-term economic growth as consequence of human capital accumulation. Developed by Robert Lucas, Jr., [1] building upon initial contributions by Hirofumi Uzawa, [2] it extends the AK model by a two-sector setup, in which physical and human capital are produced by different technologies.
A dual economy is the existence of two separate economic sectors within one country, divided by different levels of development, technology, and different patterns of demand. The concept was originally created by Julius Herman Boeke to describe the coexistence of modern and traditional economic sectors in a colonial economy.
Uzawa, Hirofumi (1963). "On a Two-Sector Model of Economic Growth II". ... "Time Preference and the Penrose Effect in a Two-Class Model of Economic Growth" (PDF).
These are models with two sectors, producers of final output and an R&D sector: the R&D sector develops ideas which grant them monopoly power. R&D firms are assumed to be able to make monopoly profits selling ideas to production firms, but the free entry condition means that these profits are dissipated on R&D spending.
Mahalanobis became essentially the key economist of India's Second Five Year Plan, becoming subject to much of India's most dramatic economic debates. [3] The essence of the model is a shift in the pattern of industrial investment towards building up a domestic consumption goods sector.
Fei–Ranis model of economic growth has been criticized on multiple grounds, although if the model is accepted, then it will have a significant theoretical and policy implications on the underdeveloped countries' efforts towards development and on the persisting controversial statements regarding the balanced vs. unbalanced growth debate.