Final answer:
High mass consumption stage is exemplified by high-income economies like the United States, Canada, the European Union, Japan, Mexico, and China, which focus on consumer goods and service industries.
Step-by-step explanation:
Examples of countries in the stage of high mass consumption include some of the world's high-income economies such as the United States, Canada, the European Union, Japan, Mexico, and China. These countries have large economies with a significant capacity for consumer spending on a wide array of goods and services. The high mass consumption stage is characterized by a shift from basic manufacturing to service industries and a focus on consumer goods. Countries at this stage often see slower GDP growth compared to lower-income countries that are rapidly industrializing and investing in physical and human capital.