Generally speaking, it just runs in cycles. For instance, in the US, War II (Baby Boom) sparked massive prosperity (with a peak in the late 90s regardless of whether you liked Democrats or not). However, prosperity leads to debt (Well, maybe that's politics related) and of course, as in Japan around 1990, eventually the generation dies off - causing a standstill or worse.
Anyway, not to be superstitious, but the 1930s was coming from a cycle, so was 2008 and whatever that might come next.
Anyway, not to be superstitious, but the 1930s was coming from a cycle, so was 2008 and whatever that might come next.







