"Refuse to give up, your mistakes don't define you
They don't dictate where you're heading, they remind you
That time keeps ticking"
I think T.I. was talking more about personal growth than GDP growth, but you will soon see the importance of the last sentence "Time keeps ticking" for GDP.
Take for example two countries such as Sweden and Spain. In 1950 Sweden had a GDP/capita of $11316 and Spain's GDP/capita was $4012. That's a relation of
4012/11316 = 0,35, in other words, Spain's GDP back in 1950 was only 35 % of Sweden's. Now let us look at the GDP in 2009 of both countries. Sweden's GDP is $39488 and Spain's is $34769, that gives us a relation of
34769/39488 = 0,88 = 88%. From being 1/3 the size of Sweden's economy Spain's GDP is now 9/10 of Sweden's.

The interesting thing is what is behind this development. Let us look at the growth of GDP for both countries during this period. Using this equation and solving
for
g or by using the
rate function of an excel spreadsheet this gives you a anual growth of 2,14% for Sweden and 3,73% for Spain between 1950 and 2009. Comparing the two economies' GDP in 1950 with 2009 shows that 1,5% more growth makes Spain's economy almost nine times larger in 50 year when 1,5% less growth makes Sweden's economy only about three times larger. That is the power of the time that keeps ticking.
I'm going to take advantage of some work from my Growth Theory class here and first show some very interesting but sad facts and then some equally interesting but a bit more positive facts.
First. Let us look at this graph that shows how world GDP/capita has converged over time the last 50 years.
This graph shows that during the last 50 years the GDP/capita for Western Europe, North America and Oceania has indeed converged, that is the standard deviance between these countries' GDP has become smaller. The graph also shows however that GPD/capita, if we count
all countries, has
not converged but rather, the standard deviance, which is the measure used here, has become larger with time. This sadly means that measured in GDP/capita the world is a more inequal place today than 60 years ago and that it has gotten a lot worse in only the last 30 years.
Now the positive facts. If you look closer at the graph you can see that the standard deviance has become smaller in last couple of years, let us hope that is just not something tendency but that it will keep on falling.
If, by using the same formula as above, you compare World GDP/capita growth the between 1950-2009 with growth the last ten years, between 1999-2009, you can see that between 1950-2009 it was 1,59% and that in the last ten years it has been 2,37%. Add to that the fact that most rich countries has had slower average growth the last ten years than they had the last 60 years this must mean that there are other economies growing more than before.
This second graph shows GDP/capita growth of some countries the last ten years and there you can see that fortunately growth is now occuring in other places than the rich part of the world. You can also see, a bit surprisingly, that some of the VISTA-countries have not had very high growth in the last ten years.
Hopefully this will mean that the blue line in the first graph will take a dive towards the red on in the coming decades.
Although. Keep in mind that even if Angola in future can keep the same incredible growth as the last ten years it would still take them more than 20 years to reach the same GDP/capita as Sweden has today!
Source:
Groeningen Growth and Development Centre, The Conference Board: Total Economy Database