11.   The car tax had a negative effect on car sales.

12.   The negative effects, however, were the less welcome members of society coming and going quite freely.

13.   These negative effects of direct taxation can not any longer be ignored.

14.   These results show a significant positive effect of maturity on volatility, and this contradicts the Samuelson hypothesis of a negative effect.

15.   While the net negative effect on employment is small, this apparently minor response masks some disturbing compositional changes.

16.   With Ian, his inner sensitivity has a negative effect mainly in his working environment.

17.   My drinking was starting to have a negative effect on my work.

18.   All this had an extremely negative effect on the criminal justice system.

19.   Car exhaust has a negative effect on the environment.