Buying - and exchange rates

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Once you have balanced the multitude of pros and cons of the are in which you;ve decided to buy there is hte important consideration of exchange rates. Even a few pence can have an impat if you are spending a substantil sum. Amongst the numerus postings here I recall seeing a warning about the dollar dropping, making the purchase a property in the US or other countries linked to the dollar a more attractive proposition. I can understand fully the numerous causes of a possible decline in the dollar's worth - permanent or temporary. But does anybody have any fact-based ideas on when this is likely to occur, and whether the drop is likely to be more than just one or two cents? As I shall soon be in a sterling/dollar link on my new home, a reliable prediction(if such a thing exists) would be most welcome.