It's not always as straightforward as it may seem to measure the size of a city or urban region.

There's the problem of which urban boundary to use. And then once you've landed on that, there's the additional problem of estimating how many people live within it. This can be particularly challenging when it comes to informal settlements, where there isn't reliable population data.

The most common approach is to use the continuous built-up area as the urban agglomeration, as opposed to any sort of "city proper" boundaries. And this is exactly what the United Nations has done in its latest World Urbanization Prospects report.

Here, they have fundamentally revised their measurement methodology by using a new, so-called harmonized geospatial approach. If you'd like to nerd out on the specifics, you can do that here.

But one of the key takeaways is that this new methodology has resulted in a reordering of the world's largest urban agglomerations. At the top is now Jakarta, followed by Dhaka:

Previously, Tokyo was thought to be the world's most populous megacity, but it has dropped down to 3rd in this new report. And by 2050, it is forecasted to drop even further to 7th place:

As we spoke about yesterday, the world's economic center of gravity is rapidly shifting toward Asia. And that shows up in these charts.

I have a strong desire to visit the largest cities in the world. It's fascinating to see how such large urban clusters manage to organize themselves. There are always systems that naturally emerge to make things work, even if it feels chaotic on the surface.

I've only been to 3 cities from the 2025 chart, so I have my work cut out for me.

Cover photo by Rifki Kurniawan on Unsplash

My recent post titled "Canada must become a global superpower" has quickly become one of my most-read posts in the almost 12 years that I have been writing this daily blog. Within a few days, it quickly got to 11x the number of daily views that I typically get.

One of the points that I made was about Canada's population, and specifically the target set by the Century Initiative of 100 million Canadians by 2100. Today I'd like to expand on this point, because I'm seeing more people talk about it on the socials.

At the time of writing this post, Canada's official population clock from Statistics Canada was sitting at 41,591,151 people. So to reach 100 million in the next 75 years, it would mean we would need to grow our population by 58,408,861 people. At first glance, this seems like a big number. And to some, it has proven to be an unsettling proposition. But 75 years is a long time for compounding to work its magic.

For us to reach 100 million Canadians by 2100 it would mean that we would need to grow our population by a compounded annual growth rate of just 1.18% per year. On our current population base, that would mean about 490,000 new people next year. To put this into perspective, since Confederation in 1867, Canada's population growth rate has averaged around 1.2% per year.

So by arguing that we want to reach 100 million Canadians by 2100, we are, in a way, just saying "we should continue what we've been doing since 1867 and not change a whole lot." The status quo should inevitably lead us to 100 million people during this time period.

Of course, history isn't exactly the same. Canada's fertility rate was much higher in previous years. At the beginning of the 20th century it was nearly five children per woman. And in 1960, it was 3.81 births per woman, which placed us ahead of the US.

Today, we are 1.26 births per woman (2023), compared to 1.66 in the US (2022). We are now among the countries classified as having "lowest-low fertility." Meaning, we're sub 1.3. What this means is that we are now more dependent on immigration to maintain the same growth rate as before.

At the same time, it's not like we're unaccustomed to high immigration. Between 1901 and 1921, Canada's population increased by almost 3% a year on average. This was in large part because of immigrants from Europe, specifically the British Isles. And between 1901 and 1911, alone, Canada welcomed 1.2 million people. This is at a time when we had just over 5 million people in the entire country.

So in the end, 100 million Canadians by 2100 is probably not all that ambitious. A compound annual growth rate of 1.5% would, for example, have us grow to over 127 million people. That would be more of a stretch. There's also the important question of how quickly are we growing relative to other countries.

Whatever the exact target, I stand by what I said before. We should be aiming to lower the cost of living for Canadians, and in particular housing costs. We should make it easier for families to have more babies, should they choose to. And we should continue to attract the smartest and most ambitious people from around the world.

Cover photo by Kevin LEE on Unsplash

The work of l'Atelier parisien d'urbanisme (or Apur) is right in my wheelhouse. Run by an architect, they are a group that analyzes, documents, and then develops strategies for urban matters impacting Paris and Greater Paris (la Métropole du Grand Paris). For example, last year they published a book called Paris Atlas, which contains 150 original maps and lots of statistics about the city. And this month, they published a note talking about population and demographic trends in the city. Here's a brief summary of this latest report.

As of January 1, 2022, there were 7,115,576 people in Greater Paris:

Between 2016 and 2022, its population grew by about 0.2% per year or about 14,800 people per year. This is slower than the previous reporting period (2011 to 2015). It's also all because of natural births:

When it comes to migration, more people leave the city each year than come to it:

This runs in contrast to a city region like Toronto, where the vast majority of our population growth comes from positive net migration. This is also true of Canada as a whole. Still, Paris is not immune to lower birthrates and a declining average household size:

Another factor impacting population, according to the report, is the decline in principal residences (homes occupied for more than 6 months of the year) and the rise of what the report calls "unoccupied homes", which includes secondary homes and vacation rentals. As of 2021, the number of "unoccupied homes" was estimated at approximately 19.2%:

However, in four arrondissements (1, 6, 7, and 8), the number of homes not used as a principal residence is thought to exceed 30%! This is making it even harder to build enough new homes. For example, between 2015 and 2021, Paris built approximately 30,300 new homes. (Reminder, the Greater Toronto and Hamilton Area completed about that many in one year last year.) But at the same time, the city counted 14,600 fewer principal residences. This is, I guess, what happens when you're one of the most visited cities in the world.

To end, I'll leave you all with this population density map:

The darkest areas represent more than 250 people per hectare. That works out to more than 25,000 people per square kilometer (just divide the above numbers by 0.01). At the same time, between 2016 and 2022, the population of Paris proper (not Greater Paris) decreased by an average of 12,800 people per year. This is in comparison to an average decrease of 11,900 people per year for the period of 2011 to 2016. As is the case in many/most cities, Paris' population growth is happening largely in the suburbs and in the outskirts.

Cover photo by JOHN TOWNER on Unsplash

It's not always as straightforward as it may seem to measure the size of a city or urban region.

There's the problem of which urban boundary to use. And then once you've landed on that, there's the additional problem of estimating how many people live within it. This can be particularly challenging when it comes to informal settlements, where there isn't reliable population data.

The most common approach is to use the continuous built-up area as the urban agglomeration, as opposed to any sort of "city proper" boundaries. And this is exactly what the United Nations has done in its latest World Urbanization Prospects report.

Here, they have fundamentally revised their measurement methodology by using a new, so-called harmonized geospatial approach. If you'd like to nerd out on the specifics, you can do that here.

But one of the key takeaways is that this new methodology has resulted in a reordering of the world's largest urban agglomerations. At the top is now Jakarta, followed by Dhaka:

Previously, Tokyo was thought to be the world's most populous megacity, but it has dropped down to 3rd in this new report. And by 2050, it is forecasted to drop even further to 7th place:

As we spoke about yesterday, the world's economic center of gravity is rapidly shifting toward Asia. And that shows up in these charts.

I have a strong desire to visit the largest cities in the world. It's fascinating to see how such large urban clusters manage to organize themselves. There are always systems that naturally emerge to make things work, even if it feels chaotic on the surface.

I've only been to 3 cities from the 2025 chart, so I have my work cut out for me.

Cover photo by Rifki Kurniawan on Unsplash

My recent post titled "Canada must become a global superpower" has quickly become one of my most-read posts in the almost 12 years that I have been writing this daily blog. Within a few days, it quickly got to 11x the number of daily views that I typically get.

One of the points that I made was about Canada's population, and specifically the target set by the Century Initiative of 100 million Canadians by 2100. Today I'd like to expand on this point, because I'm seeing more people talk about it on the socials.

At the time of writing this post, Canada's official population clock from Statistics Canada was sitting at 41,591,151 people. So to reach 100 million in the next 75 years, it would mean we would need to grow our population by 58,408,861 people. At first glance, this seems like a big number. And to some, it has proven to be an unsettling proposition. But 75 years is a long time for compounding to work its magic.

For us to reach 100 million Canadians by 2100 it would mean that we would need to grow our population by a compounded annual growth rate of just 1.18% per year. On our current population base, that would mean about 490,000 new people next year. To put this into perspective, since Confederation in 1867, Canada's population growth rate has averaged around 1.2% per year.

So by arguing that we want to reach 100 million Canadians by 2100, we are, in a way, just saying "we should continue what we've been doing since 1867 and not change a whole lot." The status quo should inevitably lead us to 100 million people during this time period.

Of course, history isn't exactly the same. Canada's fertility rate was much higher in previous years. At the beginning of the 20th century it was nearly five children per woman. And in 1960, it was 3.81 births per woman, which placed us ahead of the US.

Today, we are 1.26 births per woman (2023), compared to 1.66 in the US (2022). We are now among the countries classified as having "lowest-low fertility." Meaning, we're sub 1.3. What this means is that we are now more dependent on immigration to maintain the same growth rate as before.

At the same time, it's not like we're unaccustomed to high immigration. Between 1901 and 1921, Canada's population increased by almost 3% a year on average. This was in large part because of immigrants from Europe, specifically the British Isles. And between 1901 and 1911, alone, Canada welcomed 1.2 million people. This is at a time when we had just over 5 million people in the entire country.

So in the end, 100 million Canadians by 2100 is probably not all that ambitious. A compound annual growth rate of 1.5% would, for example, have us grow to over 127 million people. That would be more of a stretch. There's also the important question of how quickly are we growing relative to other countries.

Whatever the exact target, I stand by what I said before. We should be aiming to lower the cost of living for Canadians, and in particular housing costs. We should make it easier for families to have more babies, should they choose to. And we should continue to attract the smartest and most ambitious people from around the world.

Cover photo by Kevin LEE on Unsplash

The work of l'Atelier parisien d'urbanisme (or Apur) is right in my wheelhouse. Run by an architect, they are a group that analyzes, documents, and then develops strategies for urban matters impacting Paris and Greater Paris (la Métropole du Grand Paris). For example, last year they published a book called Paris Atlas, which contains 150 original maps and lots of statistics about the city. And this month, they published a note talking about population and demographic trends in the city. Here's a brief summary of this latest report.

As of January 1, 2022, there were 7,115,576 people in Greater Paris:

Between 2016 and 2022, its population grew by about 0.2% per year or about 14,800 people per year. This is slower than the previous reporting period (2011 to 2015). It's also all because of natural births:

When it comes to migration, more people leave the city each year than come to it:

This runs in contrast to a city region like Toronto, where the vast majority of our population growth comes from positive net migration. This is also true of Canada as a whole. Still, Paris is not immune to lower birthrates and a declining average household size:

Another factor impacting population, according to the report, is the decline in principal residences (homes occupied for more than 6 months of the year) and the rise of what the report calls "unoccupied homes", which includes secondary homes and vacation rentals. As of 2021, the number of "unoccupied homes" was estimated at approximately 19.2%:

However, in four arrondissements (1, 6, 7, and 8), the number of homes not used as a principal residence is thought to exceed 30%! This is making it even harder to build enough new homes. For example, between 2015 and 2021, Paris built approximately 30,300 new homes. (Reminder, the Greater Toronto and Hamilton Area completed about that many in one year last year.) But at the same time, the city counted 14,600 fewer principal residences. This is, I guess, what happens when you're one of the most visited cities in the world.

To end, I'll leave you all with this population density map:

The darkest areas represent more than 250 people per hectare. That works out to more than 25,000 people per square kilometer (just divide the above numbers by 0.01). At the same time, between 2016 and 2022, the population of Paris proper (not Greater Paris) decreased by an average of 12,800 people per year. This is in comparison to an average decrease of 11,900 people per year for the period of 2011 to 2016. As is the case in many/most cities, Paris' population growth is happening largely in the suburbs and in the outskirts.

Cover photo by JOHN TOWNER on Unsplash