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But what if, instead, the only point you want to make is that the 2 largest distributors control 65% of the market.
In fact, if you sort your pie slices from largest to smallest, you don’t need to depend on visual comparisons. Some in the hard-core scientific community do not recognize emotion as a valid reason to use pie charts. Research shows that it’s easier to estimate the percentage value of a pie chart compared to a bar chart.
Especially as pie charts become smaller, and you need to use a lot of them, pie charts can communicate percentages much more quickly than bar graphs. Tufte is wrong to make an assertion about pie charts based on his own context (the analysis and presentation of complex data) and use broad strokes to apply that to domains where he has no expertise (presenting and selling ideas in the boardroom).
Out of curiosity about why Tufte so hates PowerPoint, I actually paid for and went to his seminar (which comes with all his books). In short, his world is that of one, flat graphic that is data dense (and therefore how to represent that dense data, sans narrator, is the center of his target).
Unfortunately he lambastes PowerPoint and presenters without conceding that there are different, albeit radically important, distinctions between those modalities. Thank you Roger and I appreciate the perspective of someone who has attended a Tufte lecture.
I think Tufte has done a nice job of analyzing and commenting on data-dense graphics (and I’m talking hundreds of data points, like astronomical maps).
I secretly love pie charts, and I am a bit ashamed of it considering how much they are hated by gurus like Tufte. I wonder though if the better solution to compare values and emphasize a market share (your first point) would not be a single bar chart : more precise and allows you to see the largest contributors easily. If you have to use multiple colors to represent one data series, you’re using the wrong chart. I agree that for some very simple data samples, it’s more effective using pie charts than bar charts.
Another alternative to pie charts and bar charts, lying somewhere in between, are Stephen Few’s bullet graphs. In the last 200 years the population of our planet has grown exponentially, at a rate of 1.9% per year. Eighty-two years after the original development of the four stage Demographic Transition Model (DTM) by the late demographer Warren Thompson (1887-1973), the cracks are starting to show on the model that for many years revolutionised how we think about the geography of our global population.
The mainstay of the geography classroom in secondary and tertiary education is the 4 part DTM.  Its theoretical representation shows a graph whereby high and fluctuating birth and death rates dramatically decline in stages 2 and 3 and come to equilibrium in stage 4 whereby birth and death rates are low. I would by no means be the first to suggest we may be entering something what would be best defined as stage 5.
Firstly, a distinction needs to be made between the old world, the new world and the whole world. The most startling example of the exhaustion of stage 4 is Russia’s recent demographic performance.
Some current trends lead to some fascinating projections of the future demographic make-up of the most technologically advanced factions of our global society.
Another dimension to a ‘stage 5 family’ is the inter-generational relationships between 3 and sometimes 4 generations of a single blood line.
The decline of fertility in Europe has reached a point where it is below the replacement level needed to sustain the population. Clearly, Thompson’s 4 stage DTM is increasingly outdated in most developed parts of the world. Edward Morgan is a 3rd Year Human Geography student at the University of St Andrews, Scotland.



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Warren Thompson (1887-1973), the cracks are starting to show on the model that for many years revolutionised how we think about the geography of our global population. Millennial Momentum: How a New Generation Is Remaking America by Morley Winograd and Michael D. On the contrary – this is extremely common in business presentations where the goal is to tee up issues for discussion, not just lay out the data for detailed study and comparison. That’s understandable given their mission of presenting data truthfully and accurately. And they know that precise logic and measurements are not enough; you also have to appeal to them emotionally.
That’s because pies have an invisible scale with 25%, 50%, 75% and 100% built in at four points of the circle. The problem, as you point out, is his inability to make allowances for any other type of use.
You can use color to represent different categories, like countries or competitors, especially in a pie chart. People can gather around data- and text-rich documents and have a discussion, ask questions, solve problems. When only two parts of the whole are compared, pie charts convey the information faster and more easily.
In the end, it’s about using any tool that communicates the point you are trying to make. I think the points you’ve touched on are valid concerns, and yet they actually are addressed in the Tufte books.
He suggested that we were in the midst of a transition, from an ‘old’ world dominated by high mortality, autocracy and subsistence to a ‘new’ world characterised by low mortality, democracy and an ever globalising economy. Simultaneously intertwined in the graph is a line representing population growth rates which starts low, increases exponentially and levels off in stage 4.
Countries of the developed world have long said farewell to times where woman used to be chained to an animal cycle of reproduction and death used to be an almost daily occurrence. The three main indicators of stage 5 of the DTM are: a very low birth rate, a low death rate and a slow decrease of the total population. The ‘old’ world simply refers to the relatively undeveloped world characterised by high birth rates and a predominantly agrarian economy.
Since the breakup of the Soviet Union, Russia has lost 5.7 million people through higher death rates and lower birth rates. The only phenomena sustaining the level of population in these countries are the diasporas of overpopulated Africa and Asia.
The low birth rate, especially in Europe, has allowed for an empowerment of women unseen before in history.
That is to say, it creates a situation where a grand child can have a relationship with a parent, a grand-parent and sometimes even a great grand-parent thanks to longer life expectancy and low death rates. The reason that the European population is still growing, albeit slightly, is because of the influx of immigrants. One possible solution to the dilemma of lost identity, rapid aging and depopulation may be a policy aimed at reversing the negative correlation between economic development and fertility.


We have an offer for you to learn About the MCAT through our online service and extend your knowledge for your future. One thing I just want to say is that your design is so perfect.It is really nice to see the best information. In fact, pie charts CAN be a better way to visualize side by side data when the data is simple.
But this requires some extra mental gymnastics by the reader to understand the bar chart represents 100%. And the angle of the pie’s interior corner provides an additional cue not available in unlabeled bar charts. My goal with writing this article is to help people feel better about using pie charts in certain situations, which can improve their communication effectiveness. Although, astrology is based on numbers (years, months and dates) so not completely devoid of data. Our global society, slowly but surely, was moving to what he described as a ‘stage 4’ of the DTM: an earthly paradise in which mortality, fertility and population growth are low. Not only has Europe entered stage 5 of the demographic transition, it’s now facing the challenge of its related social issues*. This of course is rare in the ‘old’ world where a child may never know a grandparent beyond childhood. The resulting greater multiculturalism can strain the patience of the most liberal and tolerant of people.
It’s not necessary to see that one slice is 1% larger than another slice to have that discussion. The birth rate is the lowest the human race has ever experienced and for the first time since the Stone Age (excepting medieval plagues), the total population of some developed countries are in decline.
The ‘new’ world refers to the developed world of places which include East Asia, Europe, North America and increasingly parts of the developed world, notably China. This financially advantages both the parents and the 1 or 2 children who can enjoy a healthy share of the family income. The reader may care to notice that this particular geography of the family, a 1 or 2 child household with living grand-parents, is not all that unusual. It is a well known script from social scientists that immigrants tend to form insular communities in their arrival destination.
Billari published an article in Nature 36 months ago outlining an irregularity in one of the most established relationships in the social sciences. After the meeting, the PowerPoint slides will become a document that others will read on their own.
We like them in appropriate circumstances – data is 1-5 parts of a whole that total 100% when combined. The developed world is now one that experiences a low death rate and therefore an aging population, a birth rate far below the replacement level and a flat lining of population growth.
Much of the developed and developing world has already reached stage 4 and many countries are headed decisively into stage 5. The conflict between the British far-right pressure group, the English Defence League and British Muslims provides a textbook example of problems that arise from the ever evolving demographic transition. Although it is normal for fertility decline in medium to high-HDI countries, there is evidence for fertility increase in areas of very advanced human development.  Perhaps it is this that could serve as a new model of what might be called ‘stage 6’ of humanities ever changing demographic transition.
That isn’t quite what we are saying and so it takes a bit of mental gymnastics for the reader to adjust the line graph to its intended meaning.



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