The bar chart below gives information about the number of middle-income families (millions) in the world and in different continents.

The bar chart illustrates the number of average income households throughout the world and in various continents between 1950, 2007, and 2030. Overall, there is a clear hierachy among the continents, North America is the dominant group and Africa and Asia is less significant ones. In detail, North America recorded the highest values, standing at […]