Op-Ed: What's good for US is good for the world, so let's put our economy first
Op-Ed: What's good for US is good for the world, so let's put our economy first · CNBC

Being by far the largest transactions and store-of-value currency, the dollar is a direct and powerful transmission mechanism of American monetary policies to the rest of the world.

This rather unique situation, where a national legal tender also serves as a currency of choice in most global flows of trade and finance, remains a hotly debated issue. I shall put to the side the political aspects of that discussion in order to concentrate on economics.

And the key economic policy question is this: Since the dollar is the world currency, should the Fed's decisions be couched in terms of global economic issues, or should the Fed just focus on the U.S. economy?

To confuse the gallery, the argument is often presented as a dollar dilemma: "Defend" the dollar (with rising interest rates) and damage the U.S. economy, or let the dollar go where it may (aka, the dollar's "benign neglect") to "protect" America's economic growth.

A false dilemma

In fact, there is no dilemma. The Fed does best for U.S. national interests and for the rest of the world when it lives up to its own policy mandate.

What? I can hear the howls about the simplistic (and jingoistic?) "America First" ideas. So, please let me explain by using the Fed's mandated policy objectives about growth, employment and price stability.

With its 35 percent share of the total output in the industrialized world, and its external sector amounting to nearly one-third of GDP, the U.S. remains the principal mover of global demand and employment. Even with a weak 1.5 percent annual growth in the first three quarters of this year, America was still making (in the 12 months to August) a net contribution of nearly $750 billion to global economic growth.

Who says better? Nobody …

Over the same period, China was taking out of the rest of the world a whopping trade surplus of $570 billion. During the same interval, the euro area was also living off the rest of the world with a trade surplus of $290 billion – 96 percent of which was accounted for by Germany , the Europe's lecturer-in-chief on how to live well with austerity, employment-killing structural reforms, rising poverty and chaotic immigration policies. Just don't ask Hungary's (dissenting) Prime Minister Viktor Orbán for comments on any of these lecture points.

Now, imagine how much the East Asian and European free-riders are rubbing their hands with glee knowing that the Fed will continue to provide strong support to American jobs and incomes. Price stability and the dollar's stable purchasing power are the two faces of the same coin. Both are monetary phenomena, and both are binding constraints on Fed's policies.