[jdk354]

Your cash over time is guaranteed to lose almost all its value. While, if you invest in something, it could be even gold or silver, could be a house, could be a global market cap index fund, it holds more of its value than a fiat currency does. So no, fiat currencies lose everything and even with risks involved with other investments, the risks are still less than cash. Cash over time is one of the worst investments.

[layer8]

It depends on your time horizon. Over a period of say ten years, cash is unlikely to lose almost all of its value, whereas for stocks the likelihood can be higher. The stock market may crash (like it has in the past) at an inconvenient moment where you’ll then be happy to have some cash on hand.

[nine_k]

In 10 years, at 3% inflation, cash loses about 26% of its value, and at 5% inflation, about 40% of its value.

Not "almost all", but that bucket is quite leaky.