Shares fell after the company said profit growth would slow in the second half.
Analysts said it could slow revenue growth in the second half of the year.
The growth rate slowed sharply in the latter half of the year.
Economists forecast economic growth will slow by up to one percentage point in the second half of the year.
The growth rate has slowed significantly in the first half of 2012.
But at 32, Wills began to slow in the second half.
Economic growth has slowed in the second half of 1996, easing inflation pressures even further.
It is one reason the stock market slowed in the second half of the year.
"Spending growth will slow in the second half even as cost pressure continues to build for many retailers," the analysts wrote.
The pace slowed in the second half, but there was no more scoring.