Insider trading is a global issue affecting financial markets worldwide, from the US to Hong Kong. The Zambezi River analogy highlights the extreme price movements in stock markets during crashes.

The mighty Zambezi River has its source in northern Zambia, and flows north, west, south, then east, tracing borders for several countries including Zimbabwe. As the river enters Zimbabwe, the water molecules begin to flow faster, unknowingly energised – developing first into a rush, then eventually a torrent as they plunge down the Victoria Falls. This is an excellent analogy of the extremes of stock market price movements. In a stock market crash, prices move slowly, then very fast. My...