Once the dot.com market started to crack, investors soon realised that these internet companies weren't really worth anything at all, but was this enough for them sell up before the bubble burst?

Transcript -- How was the dot.com market valued?

Sir Isaac Newton observed that he could track the movement of the stars but not the madness of men. This fast paced album looks at the history and causes of economic bubbles and focuses on the highs and lows of the dot.com boom of the early 2000s. How do we spot a bubble emerging? Why do we buy into it? And what are the consequences when a bubble bursts? This material forms part of The Open University course DB234 Personal investment in an uncertain world