Is it 'popping' or has it popped? The other example bubbles don't all drop to zero. Notably that 'gold' bubble (that I admit I've never heard of). I'll say it h

Is it 'popping' or has it popped? The other example bubbles don't all drop to zero. Notably that 'gold' bubble (that I admit I've never heard of). I'll say it has popped with certainty only when it's been years and the price hasn't risen again. Also what's with the Mississippi Company value having distinctive step-like patterns? I assume they represent the banks refusing to pay for long periods