Separate question than my other one: Strength seems like something that can only be measured relatively, so I am a bit confused by the demographic claim here - if the US is weak because they have fewer people the right age, but most other countries and especially China have urbanized and seen demographic change even faster... doesn't that mean the US would actually relatively stronger than other countries who were hit even harder by the same trend? If the population of the US was 400M but the population of China was 2B, say?