A breakdown of the manetary system.
It is said that specially to an advanced nation, civilization become ripely , the society have low technical development. So, this society lose vitality. It born a scramble of existing jobs. Furthermore, human relation become very estranged. So, many people have act of litigating. Many people can not trust each others, basic of society cooperativeness shakes. Manetary system consist of trust each other. But this situation have low value, at last, it occurs super inflation and manetary system have risk of breaking down.