Final answer:
Countries 'below today's applications threshold' do not include those with rapid economic development and high technology, such as South Korea, which is known for advanced Internet speeds and a high standard of living.
Step-by-step explanation:
South Korea is considered as 'ready for tomorrow' in terms of its Internet speed, due to its comprehensive overhaul of energy and transportation networks that includes high-speed rail service and increased capacity in electronic transmissions lines, among other green-based initiatives. In contrast, countries that are 'below today's applications threshold' have not demonstrated the same level of progress, likely due to poor economic, mortality, and demographic indicators. Examples of such countries typically include those with slow socio-economic development and low technological adoption rates compared to more advanced nations like South Korea. Using South Korea as a reference point for a country with rapid economic growth, high technology, and a high standard of living, we can conclude that the countries 'below today's applications threshold' would not include rapidly developing or technologically advanced nations.