Value is vague on purpose, since it means that something retains its “essence” tomorrow as good or better than today. Otherwise humans would not even be able to feed themselves since the only reason I can have food in the winter is because I have something to exchange for food from places that have figured out to grow or store food. It also would be a terrible place if we worked very hard today and our returns depreciated rapidly, because there will be times when we can’t work
Sure, stocks and bonds have historically held some value, but is near impossible to out perform base inflation and has gotten worse the last 20+ years. Physical land and tangible long term goods have held up, but difficult to use for trade, hence currency