If you invest, you invest in 'real' things, and you make sure you can physically control them. Numbers in a computer are not 'real', they can be altered at will

If you invest, you invest in 'real' things, and you make sure you can physically control them. Numbers in a computer are not 'real', they can be altered at will, unlike a bar of copper or gold or iron. Numbers in a computer, or your things in a Bank's security box are not yours at all. They can be taken away from you at a moment's notice, or without any notice at all. There used to be the old joke that you should keep your money under the bed. Like all jokes, it has a core of truth. Cash under your bed is yours for sure. Your cash in a Bank is dependent on the Bank letting you have it back. Read up on 'Bank Runs' and 'Cyprus Bail-Ins'.