HC Deb 27 April 1981 vol 3 c338W
Mr. Deakins

asked the Chancellor of the Exchequer what assessment he has made of the extent to which income tax cuts of 1979 have achieved the purposes that they were intended to fulfil; and if he will give details.

Mr. Peter Rees

While I have no doubt that the income tax reductions in the 1979 Budget had a positive effect on work incentives, it is impossible to assess the precise impact, because of the changes in the economy that have occurred since then.