The GNI conversion problem. In order to classify countries according to GNI per capita each country’s GNI
must be converted to dollars. Asking a class if, given statistics on GNI for a particular economy in local
currency, how they would convert this figure into dollars you are sure to be told that you should use the
exchange rate. It is often useful at this point to ask students if they have traveled and what the exchange rate
has played as they paid for things and tried to keep track of what they had spent. To being a discussion of
the purchasing power parity ratio, it is then helpful to again turn to the class, ask if they believe most things
in less-developed countries are as expensive as they are in developed countries. This invariably leads to a
discussion of why most items are significantly cheaper in the former. While the Big Mac Index from the
Economist helps illustrate this same point, another useful resource is the website Numbeo
(http://www.numbeo.com/cost-of-living). A quick calculation of the un-weighted average of the figures for
groceries in an LDC such as Bangladesh or simply the CPI +rent index given and then comparing these
results to the same data for the U.S., Japan, the U.K., or some other developed country illustrates how the
cost of living differed considerably across the world. To further drive the point home it is often useful to
compare the purchasing power parity ratios of different developed countries. Particularly striking is a
comparison of the U.S. and Japan. Finally, it is helpful to note that the ratio of the purchasing power parity
ratio to the exchange rate gives us a measure of the relative cost of living and to discuss why this is the case.
You could do a few calculations showing the difference converting local currency figures into dollars using
the purchasing power parity ratio as opposed to the exchange rate. While going through these calculations
(perhaps having students do them themselves in class and provide you the answers) it is important to
emphasize that the purchasing power parity ratio’s sole function is to capture differences in the cost of
living and the exchange rate implies that the cost of living is equal across countries.
After discussing GNI and the GNI conversion problem you can also discuss:
Classifying countries using GNI per capita, or the human development index and comparing the two
classifications. Show the students what factors are represented in the HDI and how it is computed
(note the new coefficients in the newer version). This can further focus student attention on the broader
meaning of development and the importance of looking beyond average income levels. Table 2.4 on
page 55 contrasts GDI per capita with HDI levels to show that a certain level of GDI does not
guarantee an equivalent HDI..
Characteristics such as education, literacy, and share of industry in GNI tend to change predictably with
the level of GNI.
Section 2.4 goes into detail regarding the ten common features shared by developing economies. Given that
these are dealt with in detail in later chapters it might be best to simply discuss most of these topics in very
general terms at this point . For example, population growth is the focus of Chapter 6 while education and
formation of human capital is the focus of Chapter 8. Despite these similarities the differences need to be
discussed as well. Perhaps the most straightforward way to draw attention to the diversity that exists
between developing nations is to spend time discussing differences in natural resource endowments, weather,
and climate as the topic of adverse geography is discussed or the differences in the type of colonial regime as
this topic is discussed at the very end of section 2.4.
Introduce the concepts of modern economic growth and structural change. Traditional society and modern
economic growth can be placed in historical perspective and a short discussion on the different conditions
faced by developing countries and currently developed countries can follow. The legacy of colonialism and
dependence in representative countries from various developing regions can be contrasted.
Discuss the various theories of Comparative Development.
Discussion Topics
Ask the students what they think the common features of developing countries are and make a list of
their suggestions on the board. At the end, add anything that they have missed. Along the way you can
elaborate on their suggestions.