I hear this all the time but I don't understand what hoarding means in this context. Surely you're not implying that the majority of any billionaire's wealth is

I hear this all the time but I don't understand what hoarding means in this context. Surely you're not implying that the majority of any billionaire's wealth is just cash under their mattress? I'm fairly sure that most of any given billionaire's wealth is invested, often in equities or bonds. In that sense, they are letting others borrow their money and funding economic development. Same goes for money sitting in a bank that gets loaned out.