Economics- Trade.  Exchange rates for business

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Terms of trade etc

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https://youtu.be/wmqnCjjidEM

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Biz studies through diagrams

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https://books.google.co.uk/books?id=yuidG12H1VsC&printsec=frontcover&dq=business+studies+through+diagrams&hl=en&sa=X&ved=0ahUKEwji4Mf9883aAhVDBMAKHbMeDicQ6AEIJDAA#v=onepage&q=%20Exchange%20rates&f=false

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