3: Dollar Exchange Rate from 1971
By 1971, Britain had been free of the original Gold Standard for forty years, although through its Bretton Woods agreement it had pegged the pound on a "pseudo Gold Standard" since 1945.
Following the devaulation of the pound in 1967, the exchange rate was fixed at $2.40
Then, in 1971 the US suspended the ability to freely convert between currency and gold, and the last vestiges of the Gold Standard disappeared. Britain unpegged (floated) the pound and, in effect, the brakes were removed, and the freely-traded currency we see today was established.
The graph above shows the fixed rates up until 1971, and the subsequent variations of the floating pound/dollar over the following years.
The variability of the £/$ rate from 1971 is obviously substantial and can be seen more clearly in the graph below - from a high of $2.44 at the end of 1980, right down to a low of $1.05 (caused by the severe weakness of the pound) in February 1985.
By February, 1991, it had almost reached $2 and, after falling back, in September 1992, it actually rose above $2 for the first time in 20 years.
And then Norman Lamont (UK's Chancellor of the Exchequer) decided to take the pound out of the ERM.
This immediately devalued the pound, and the results were dramatic - the pound plummeted in value, falling to $1.75 within a month, and to just over $1.40 in five months.
Anyone starting a two-week holiday in early September, 1992, might have seen a $1000 hotel bill effectively rise by over £100 from the day they arrived to the day they actually paid the bill. And in six months the pound had been devalued by more than 25%.
From this point on, the exchange rate rose and fell fairly gently, hitting a low of $1.38 in June, 2001. Even the events of "9/11" seem to have had very little effect on the short term value of the dollar, but in January 2002 the dollar started a fairly steady drop in value, with the sterling rate reaching a peak towards the end of 2004 of $1.94.
May 2005 saw the pound weakening and the dollar strengthening. This trend was already in place before events of 7/7 in London, which appear to have had very little effect on the value of the pound against the dollar.
Through 2005, the dollar strengthened and the pound weakened, and the end of the year saw the rate at only $1.73. But it wasn't long before the worsening American economic situation saw this trend reversed.