The data below show exports and imports for the UK, 198792, in bn at current prices. (a)

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The data below show exports and imports for the UK, 1987–92, in £bn at current prices.

1987 1988 1989 1990 1991 1992 132.1 Exports Imports 120.6 121.2 126.8 133.3 135.5 122.1 137.4 147.6 148.3 140.2 148.3


(a) Construct index number series for exports and imports, setting the index equal to 100 in 1987 in each case.

(b) Is it possible, using only the two indices, to construct an index number series for the balance of trade? If so, do so; if not, why not?

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