The concept and global trends of urbanisation

Urbanisation refers to the increase in the proportion of a country's population living in urban areas, such as towns and cities. These areas are becoming more populated over time, and the trend is a significant global phenomenon.

Key features of urbanisation worldwide

• Population shift - Over half of the world's population, approximately 3.9 billion people, now reside in urban areas.
• Growth in popularity - Urban areas are increasingly seen as popular places that are getting increasingly populated.
• Global disparity - Urbanisation is happening fastest in poorer countries.

Variations in urbanisation rates across different country types

The rate at which urbanisation occurs depends largely on a country's level of economic development. This creates distinct patterns between richer and poorer nations.

Urbanisation in advanced countries (ACs)

• Economic status - ACs are more economically developed nations.
• Historical context - Urbanisation in ACs began earlier, particularly during the Industrial Revolution, leading to a majority of the population already living in urban areas.
• Slow growth rates - Currently, urban growth in ACs is very slow as most people are already urbanised.
• Rural migration trends - Many individuals in ACs are moving from overcrowded cities to rural areas, seeking a better quality of life.
• Supporting infrastructure - Good transport and communication networks allow people to live in rural areas and commute to cities or work from home.

Urbanisation in low-income developing countries (LIDCs)

• Economic status - LIDCs are less economically developed.
• Current urban population - Not many of the population in LIDCs currently live in urban areas.
• Rapid growth rates - The fastest rates of urbanisation in the world are in LIDCs.

Urbanisation in emerging and developing countries (EDCs)

• Economic status - EDCs are nations where economic development is increasing, sometimes rapidly.
• Varied urban populations - The percentage of population living in urban areas varies between EDCs.
• Growth patterns - Some EDCs are experiencing rapid urban growth.

The characteristics and growth of megacities

Megacities are a specific type of urban area defined by their enormous population size.

Defining features of megacities

• Population threshold - A megacity is an urban area with more than 10 million inhabitants.
• Structural forms - It can be a single large city or a conurbation, where neighboring towns and cities have spread and merged together.

Growth trends of megacities

• Historical increase - In 1950, there were just 2 megacities globally—Tokyo and New York. By 2014, this number had risen to 28, with projections estimating 41 by 2030.
• Geographical distribution - More than two-thirds of current megacities are in poorer countries (EDCs and LIDCs).

The role and distribution of world cities

World cities hold a unique position in the global landscape due to their extensive influence beyond their own borders.

Defining features of world cities

• Global influence - World cities have an influence over the whole world.
• Cultural and media hubs - World cities are centers for trade and business, and tend to be hubs of culture and science, with international media centers.

Historical and current distribution of world cities

• Early dominance - In 1950, the only world cities were London, Paris, Tokyo, and New York.
• Expansion over time - The number of world cities has increased over time.
• Current spread - Most world cities are still in ACs but some are in EDCs.