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Throughout, we will be concerned about two main questions:

#1. How countries can achieve economic growth over long periods of time, especially economic growth that is as sustainable and supportive as possible of clean environments and the interests of future generations.

#2. The effects of economic growth on income distribution, health, longevity, role of women, population growth and poverty .

The record of the past century is clear regarding several matters:

  • Countries that do not achieve sustained economic growth also do not do well in protecting air and water quality, or in reducing income inequality.
  • The implications of the long run. Nobody, including economists, understands how to promote short and medium-term economic growth. The economic profession lacks this knowledge— growth is all about the long-term .
  • Attaining high long-term rates of economic growth is difficult, and is rarer than commonly thought. Example: A commission headed by Nobel Laureate Economist Michael Spence found that in 2008, only 2% of countries have ever experienced long term growth (growth over 25 years) above 5% per capita (in real terms). However, about one quarter of all countries have had transitory episodes of growth in excess of 5%.

One should not be dismayed by these numbers. Due to compound interest, a 5% growth rate economy doubles in size every 15 years – less than a generation.

Good policies — fiscal, monetary, trade, exchange rate, education — have resulted in growth rates of 2-4% over very long periods in several countries, especially in East Asia.

What does this mean?
Consider growth over a 50﹣year period in the following scenarios.

Country A:
With GDP of 100 in the year 2000. If country A grows by 1% in real terms annually, its real GDP will be 164 in 2050 (with compound growth) (GDP 1.6 times higher in 50 years).

Country B:
Also with initial GDP of 100 in the year 2000. If B grows at 2 1/2% annually, its real GDP will be 344 in 2050 (3.5x).

Country C:
Also with initial GDP of 100 in year 2000. If C grows at 4.00 % annually, in 2050 its GDP will be 711 (7x).

The Point:
While 5% long-term growth is difficult to sustain, 4% growth, or even 2 1 / 2 % growth is attainable and well worth pursuing.

These differences matter mightily for poverty reduction, health, the environment, and the role of women in society.

Those who advocate low growth in poor countries are advocating perpetual income inequality and poverty, the likes of which existed Zambia, Zimbabwe, North Korea, and Burma before 2010.

What of growth in the past five decades?

Fortunately, Developing Nations’ share of World GDP has been growing steadily over the past 50 years, from less than 25% in 1960 to 50% by 2013.

  • From 1973-1985, rich nations had a 72% share of World GDP, while Developing nations had 21%.
  • Since 2008, rich nations had a 58% share of World GDP, while Developing nations had 40%!
  • In 2013, Developing nations had a share of World GDP that exceeded 50% for the first time.
  • Fifty Developing nations saw their World GDP DOUBLE over the past five decades.

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Source:  OpenStax, Economic development for the 21st century. OpenStax CNX. Jun 05, 2015 Download for free at http://legacy.cnx.org/content/col11747/1.12
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