Currency and financial crises have strong cross-border spillover effects - instability can fairly easily spread even if neighboring countries' economic fundamentals are sound.

CNN: This monetary body would limit Crisis spillover effects

Just across the border, in Canada, the effects were just as profound.

ECONOMIST: Space technology

They are usually about domestic regulations that have international effects rather than about border controls: Europe has banned all hormone-treated beef, not just America's.

ECONOMIST: At daggers drawn

He said it was time to re-consider the effects of creating a "cross-border sub-region" of north-east Wales and north-west England which sets the framework in which councils and the Welsh Government operate.

BBC: AM warns house building would strain Welsh language

But the MPs found much evidence was anecdotal and now recommends harder evidence is gathered about the economic effects of the toll on both sides of the border.

BBC: Welsh MPs suggest ?1.50 Severn Crossings tolls for cars

Most unionists have changed covertly: in particular, businessmen hinted at their feelings by lamenting the economic effects of clashes over Orange parades, and urging greater cross-border co-operation.

ECONOMIST: Why peace is now possible

The ministry said one of the effects of the fat tax was that some Danes had begun crossing the border into Germany to stock up on food there.

BBC: Denmark to abolish tax on high-fat foods

The effects of the tightening grip of Mexican organised crime are being felt south of the border as well as north of it.

ECONOMIST: Drugs and violence in Mexico

The trickle-down effects of the explosion in trade with Iraq are more dramatic in places like the Turkish border town of Slopi(ph).

NPR: Turkey Threatens Economic Sanctions on Kurds