A trans-Atlantic train wreck now seems inevitable
  • The European Union wants to block the extraterritorial reach of U.S. legislation, and to circumvent American sanctions on Iran, with half-baked and untested measures.

  • No matter how that plays out, the impending trade clashes will damage the European and American economies.

  • As a more compact structure within the EU, the euro area can use fiscal and monetary policies to offset some of the depressive impact of weaker external demand.

The long-brewing trans-Atlantic train wreck now seems inevitable. A temporarily suspended trade fight between presumably closest friends and allies has entered an unpredictable crisis following America's unilateral trade and political sanctions against Iran .

Washington's edict that "those doing business with Iran cannot do business with the U.S." is being challenged with sound and fury — but little else — by the EU Commission, with a reportedly strong declaratory support from Russia and China .

That is an ominous development, although, formally, the EU's move to establish, and enforce, its sovereign legislative domain could be an entirely plausible act.

Regrettably, nearly two years of allied discussions about Washington's intention to renegotiate an allegedly unsatisfactory nuclear agreement with Iran have ended up in the worst ever confrontation within the trans-Atlantic community.

Immediately at stake is nearly a trillion-dollar trade business between the U.S. and Europe, with millions of jobs threatened on both sides of the Atlantic. Most of that business is captured by the 19 countries of the European monetary union – particularly by Germany , France , Ireland , Italy and the Netherlands .

Show the good side of the euro

If, as seems likely, the sanctions dispute with the U.S. were to escalate, those would be the countries with the most to lose because alternative markets for $300 billion of their export sales might not be readily available.

Still, it is important to keep those events in the proper perspective.

At the moment, the euro area economy is doing well. The current growth dynamics are keeping demand and output moving forward at twice the speed of the system's estimated potential and noninflationary growth. Apart from that, the fiscal and monetary policies have plenty of room to support economic activity and employment creation.

A 2.3 percent average annual growth in the first two quarters of this year is way above the euro area's estimated growth potential of 1.2 percent. In other words, the economy is hitting beyond the physical limits to growth that are set by the stock and quality of the human and physical capital, and are roughly approximated by the sum of the growth rates of productivity and labor supply.