But financial nihilism is far more potent than its parent because it reflects not only slow moving "real economic activity" but the rapid dynamics of systems such as the monetary system and traded markets. Both of these have very strong "make-believe" character that are prone to create rapid collective "low-effort" bubbles. To make the difference clear, it is much easier to speculate on e.g., on solarcoin, or solar power generation stocks than actually manufacture and install a solar panel.
Ultimately economic nihilism itself is a subset and derives from moral nihilism, discounting the notion that society is held together by moral values and unspoken contracts. The transactional, dog-eats-dog Hobbesian world does not burden us with having to sort out conflicting views of what constitutes "Good society". Enjoy it.