Models of Economic Growth: Smith & The Classics

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Presentation transcript:

Models of Economic Growth: Smith & The Classics ECON*2100 Week 2 – Lecture 1 Models of Economic Growth: Smith & The Classics

What do we mean by growth? Extensive growth: output only grows because inputs grow Output keeps up with population Intensive growth: output grows faster than inputs Per capita income rises This requires output per worker to rise

Output per worker Maddison p. 13: (UK, USA, Japan)

Maddison: Basis of European Expansion 1000-1820 Rise of scientific outlook Supported by technological innovation in book publishing Rise of trading centres Supported by institutional developments that made contracts and account-keeping possible Adoption of Family Law based on Christian rules Promoted monogamy and inheritance, leading to buildup of wealth and decline of clan/tribal loyalty Rise of nation states Supported by technological progress in shipping

1700s: Theories of Growth Mercantilist Physiocrats Smith Growth comes through industrial exports, government should promote these activities Physiocrats Growth derives from agriculture alone Government is a sterile entity in the economy Smith Voluntary exchange leads to specialization, which leads to growth

How do economies grow? Adam Smith, 1776: Specialization and Division of Labour A workman not educated to [pin-making] could scarce, perhaps, with his utmost industry, make one pin in a day, and certainly could not make twenty. But…one man draws out the wire, another straights it, a third cuts it, a fourth points it, a fifth grinds it at the top for receiving the head… to whiten the pins is another; it is even a trade by itself to put them into the paper; and the important business of making a pin is, in this manner, divided into about eighteen distinct operations… all performed by distinct hands…I have seen a small manufactory of this kind where ten men only were employed…[they] could make among them upwards of forty-eight thousand pins in a day. Each person, therefore, making a tenth part of forty-eight thousand pins, might be considered as making four thousand eight hundred pins in a day. It is the great multiplication of the productions of all the different arts, in consequence of the division of labour, which occasions, in a well-governed society, that universal opulence which extends itself to the lowest ranks of the people.

Specialization and exchange How do economies grow? Specialization and exchange

Malthus: Yes, but… Population growth always exceeds agricultural productivity growth Hence starvation and subsistence is unavoidable Population growth rate ZPG point Income per capita

Classical Model Based on Malthus Y = f(L,N) Diminishing returns to labour Labour Land (fixed)

Classical Model Output per Worker (Y/L) is called ‘g’ At subsistence level, call it gz Subsistence output = gz ×L

Classical Model Output per Worker (Y/L) is called ‘g’ At subsistence level, call it gz Subsistence output = gz ×L Y=gz × L Output Y Labour L Leq

Classical Model Output per Worker (Y/L) is called ‘g’ At subsistence level, call it gz Subsistence output = gz ×L Y=gz × L Output Y Pop grows  Pop declines  Labour L Leq

Summary Prior to Smith, theories of economic growth weren’t very sensible (though they still get around) Smith: specialization and trade are key to economic growth Malthus: Yes, but we’re doomed to starvation and subsistence anyway Classicals: Diminishing returns to labour means a fixed labour supply at subsistence wages

Next Solow growth model: the importance of capital investment