Saturday, April 14, 2007

On Growth Theory (Part 1)

In this posting, I pursue my colleagues’ spirit at Café Salemba on spreading economics ideas to general reader. Here, I try to keep the ideas as plain as possible. But putting economics ideas by words is not always simpler than writing by math expressions. However, let’s try.

Some central questions to macroeconomics theory are; why do economic growth rates differ across countries? Why does a country produce more while the others do not? Some countries that were poor grow faster (e.g. East Asian countries) while some countries that were pretty rich in the past grow slower (e.g. Latin America countries). Some seem to end in doom (e.g. Sub Saharan Africa). Why are the economies of some likely to converge to the same pattern (e.g. rich countries and East Asian countries)? How long does one country need to double its output and why does it take so long? Does capital gap explain the differences of growth rates among countries?


Below are some facts

Source: Charles I Jones, Introduction to Economic Growth 2002


Take Zimbabwe as a case. Its average growth rate from 1960-97 is around 0.4 percent. Hence it takes 192 years for Zimbabwe to double its output. It takes only 12 years for South Korea to double its output while the USA needs 50 years to double its output.


Here is a fact of rich countries' economies

Source: Charles I Jones, Introduction to Economic Growth 2002


The graph strongly illustrates that rich countries’ economies converge to the same pattern. Turkey, Mexico and South Korea experience the same thing. Then, another fact is

Source: Charles I Jones, Introduction to Economic Growth 2002


Some countries grow faster but some do not (see African countries). Finally, we also find that growth rates in many countries are persistent.


Source: Angus Maddison: The World Economy. A Millennium Perspective (OECD,2001)

These figures give us good clues. From this posting, we learn that economies grow gradually and stable over period, I mean there is no such “jump” up in economy. Moreover, we also find that growth rates in many countries are persistent. So far, we have four important clues: growth rates are persistent, varied across countries, they converge and grow gradually (relatively stable over periods).


Economists realize that output and factors of production (inputs such as capital and labor) may grow in a different direction. Percent of growth per se does not give us strong information about economic situation as the population also grows. Another problem: this information cannot tell for sure whether the economy of country A produces more output than that of the economy of country B.


Just pick any number, suppose Indonesia economy grows 5 % while Singapore grows 4 %. Looking these numbers and saying that Indonesia produces more than that of Singapore is not sensible. In fact, the Indonesian population increases by 3 % while the Singapore is almost zero. Here, Indonesians enjoy only 2 % additional income while Singaporeans keep 4 %.


As our fact suggests that economies converge, there must be law that both output and inputs (factor productions) move in the same direction. Well, we find the law by such a very simple way. Assuming that the population growth is not influenced by economy (we call it as exogenous since it is an external factor of our economy) and transforming all variables into per capita term make our life simpler. That is the law, "per capita variables"


Now we are ready to framing economy. Just for introduction, let us start from very simple growth model. This model assumes that an economy produces only one good; no government; no technical change; no unemployment; there are only two inputs, namely, capital and labor; saving rates, depreciation and population growth are constant (however after the model is established, we can do such some experiments on what happen if these three are no longer constant).


It is, moreover, common to think of this model as unrealistic. However I cannot agree more to David Romer’s, professor economics of UC Berkeley, suggestion[1].


I try to avoid using too much technical procedures in building our model. Let me begin from the first ‘equation’. An economy consists of capital and labor. Then, the output of economy is divided between investment and consumption. The fraction of output allocated to investment (or simply say saving rate) is assumed constant.


Since capital depreciates, capital stock (or an additional capital) must be equal to the fraction of current output allocated for investment minus the depreciation of existing capital. This is the second equation of our model.


Remember, we need that both output and inputs move in the same direction and we are interested in per capita income rather than unadjusted income. So we transform all variables into per capita terms. Since our model assumes that there is no unemployment, the terms “per capita” means “per labor”. Just for convention, later I’ll use “per labor” concept instead of per capita. But both are the same concept.


The next step is just doing simple exercise. By doing some technical manipulation[2], finally I end up with very important equation, the third equation. Then we call it as capital stock per capita.



The equation above tells that capital stock per labor should be equal to actual investment per labor (sŷ) minus break-even investment ( (n+δ)k ), where n is labor growth and δ is depreciation rate and k is capital per labor.


What is break-even investment? Intuitively, we know that capital is depreciating and population is growing. Therefore, to maintain capital per labor from depreciation and the growth of labor, we need some amount of investment which is exactly equal to (n+δ)k.


Graphically, the third equation can be drawn like this


Suppose our economy stays at K0/L, then gap BC is the amount of consumption per labor (per capita). DA is the amount of break-even investment and the rest, CD, is the amount of actual investment per labor (per capita).


Would this graph fit with empirical evidences? What does this graph tell us in reality? For a while let these things stay in our mind. I’ll continue to discuss what the graph means and implies, and we’ll find out why, according to our simple model, this statement might be true.




[1] David Romer says “The purpose of a model is not to be realistic. After all, we already possess a model that completely realistic-the world itself. The problem with that “model” is that it is too complicated to understand. A model’s purpose is to provide insights about particular features of the world. If a simplifying assumption causes a model to give incorrect answers to the questions it is being used to address, then the lack of realism may be a defect…if the simplification does not cause the model to provide incorrect answers to the question it is being used to address, however, then the lack of realism is a virtue”. Romer, David. Advanced Macroeconomics 2006


[2] The third equation comes up by differentiating the first equation with respect to time. Then dividing the second equation with capital (K) we find the growth rate of capital stock. Substituting this into the first equation, arranging them, we would find capital stock per capita

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