The foreign currency exchange rates and stock market movements are a reflection on the state of the economy and change in both the domestic and foreign policy of a government can affect the market indices.
"Polls are one thing. but when people bet, where the money goes is
often very revealing. People who are prepared to bet fairly large sums,
and who wouldn't normally bet, often have very good reasons for doing
(Sean Boyce, Director of Communications, Ladbrokes)