Well duh

From The Guardian 2 July 2010:

The evaluation concludes that, since the law [which makes it a criminal offence to pay for sex in Sweden] came in to force in 1999, the number of women involved in street prostitution has halved, whereas neighbouring countries such as Denmark and Norway have seen a sharp rise...

From The Daily Mail 12 November 2012:

Denmark is scrapping its tax on foods that are high in saturated fat after it emerged people were travelling across the border to Germany in search of unhealthy snacks for less.