hence any preferences given to preexisting abstractionpollution sources should usually be timelimited explicit consideration should therefore be given to the possibility that the regulatory approach could be partially replaced by marketbased instruments taxes or trading systems these taxes provide incentives for polluters and resource users to change their behaviour today they also provide longterm incentives to innovate for a more water secure future tomorrow although water taxes are not strongly supported by the public in all contexts there are various ways in which this support can be increased over time eg through measures to limit negative impacts on the competitiveness of certain sectors andor on income distribution