I don't know anyone who keeps cash. Like in a mattress? Most people have an IRA or they have assets like real estate
Most people earn cash and keep at least some on average. A pension is usually made up of bonds promising cash. It is a policy done to discourage holding cash, as consumerism is supposed to help business more then saving.
Keep shares in companies operating globally should help yet all currencies are related to the dollar system and real estate should be good but as we know the majority of sales are backed by government. So once again you have an inaccurate price and inflation meaning a purchase is not the bargain it could be