The higher rates raised concerns about the economy's health, which depressed stock prices.
Higher rates raise the Government's interest cost on the national debt.
Higher rates in Japan would raise returns on some investments there, making the yen more attractive.
The higher rates raised the Treasury's cost for interest payments on the national debt.
When utility companies want their rates raised, they call the Department.
In all, the rate will have raised at additional £12.6bn over the five years since it was introduced.
But he conceded that the high rates raise questions.
In 1974 this cut was partly reversed, and the top rate on earned income raised to 83%.
The higher rates raised the cost of financing the $2.6 trillion national debt.
These two rates, it was estimated, would raise about 8 million pounds.