Why 'does one need to predict what anonymous producers will want in the future' in order to save capital?
I agree with bullioner about the definition of capital.
Financial assets are not capital. Factories, energy, skills, and abilities are capital. Financial assets have been used for a long time to
control and
direct capital but that does not mean they
are capital. Financial assets produce nothing. People, machines, energy, skills, and knowledge produce everything.
My argument is that your primary focus should be building true capital: the ability to produce new wealth, and treat speculation as what it really is - gambling.