While holding the eurozone together will be costly and difficult and painful for the politicians, breaking it up will be even more costly and more difficult.

Across the continent, political divisions are deepening. For all of these reasons, the specter of a euro zone collapse has not been dispatched.

Why was there so much work-sharing in the 1930s? One reason is that government pushed for it. In his memoirs, President Herbert Hoover estimated that as many as two million workers avoided unemployment as a result of his efforts to promote work-sharing.

For those unfortunate enough to experience it, long-term unemployment - now, as in the 1930s - is a tragedy. And, for society as a whole, there is the danger that the productive capacity of a significant portion of the labour force will be impaired.

More than the Big Mac, Coca Cola, or Levi's 501 jeans, the dollar is surely the United States' signature export.

As for the single market, the E.U.'s landmark achievement, there is no question that a euro zone breakup would severely disrupt its operation in the short run.

While holding the eurozone together will be costly and difficult and painful for the politicians, breaking it up will be even more costly and more difficult.