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An examination of the performance of the FTSE All-Share index provides mixed results. The All-Share was chosen as it has a longer run of data, and also because the FTSE 100 is rather more of an international index, given the high proportion of miners and banking stocks that are not wholly focused on the UK economy.
The gains were most impressive for the births of Princes William and Harry in the 1980s. Here the gains were 19.5% and 16.5% respectively. However, these births took place in the midst of the 1980s boom, when the UK was already enjoying an impressive recovery from the dreary 1970s.