The FTSE 30 index has been running for 75 years.  It was originally started in 1935 as a measure of the frequency of trading of its listed constituents.   Those shares which were most frequently traded had a greater influence on the index.

There are only two of the oringinal constituents Tate and Lyle formed from the merger of Tate which refined sugar and Lyle which made treacle.  The company is now global operating in more tha 45 countries.

The other constituent is GKN the technology and engineering company.

The FTSE30 index was joined in 1984 by the FTSE100 index.  This is now the most frequently quoted.  Its constituents are weighted in the index according to their capital size.  Thus when the BP share price halved in value this had a dramatic effect on the FTSE100 index.

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