German Chancellor Angela Merkel toasts with beer in Dachau, August 20, 2013. REUTERS/Michael Dalder

Stop me if you’ve heard this one.

The Greeks, Italians, Spaniards and Irish walk into a bar, where the French and Germans are the bartenders. It’s happy hour, and the Germans and the French are serving half-price drinks. Although everyone quickly drinks too much, the bartenders keep on serving. Eventually, the inebriated customers head home and get into all kinds of trouble -- fights, car accidents, some broken windows.

So who’s to blame? Clearly, the Greeks shouldn’t have drunk so much. However, the French and Germans also shouldn’t have served the Greeks when they were clearly drunk -- especially if the French and Germans mind having broken glass in their neighborhood.

Unfortunately, this isn’t much of a joke. After an extended binge, Greece is now mired in financial crisis and is dragging the European economy down with it. In the last few days, Greece has defaulted on a important payment to the IMF and shuttered its banks to prevent massive flows of money from leaving the country. On Sunday, the country is slated to hold a referendum on whether to approve tough austerity measures demanded by Europe -- a decision that could determine whether Greece will stay in the euro zone.

Some of the reasons for the crisis are obvious to anyone who looks. Greece has a lot of well-recognized economic problems: Its public sector is bloated and marred by corruption, and many analysts say that the country cooked its books to hide the real amount of debt from the rest of Europe.

Greek residents are exasperated with their government, after Athens missed its $1.8 billion payment to the International Monetary Fund. (Reuters)

There are also many well-documented problems stemming from the design of the euro zone itself – that the countries share a common currency even though they have different tax-and-spending policies. So that means that even though Greek workers aren’t as economically competitive as Germans, Greece can’t lower the value of its currency to make its products cheaper abroad and stimulate exports.

The same holds true for inflation, where Greece might benefit from a higher inflation rate that would make debt in today's prices become cheaper, while Germany has a historic unease with any policy that might stimulate inflation.

The deeper origins

There are some other ideas about the deeper origins of the Greek crisis that you may be less familiar with.

Once the Greeks joined the euro in 2002, they could borrow at very cheap rates given they were now borrowing under the continent's implicit guarantee, and they dramatically over-borrowed.

"But given that there was high growth, no one was really worried about it,” says Matthias Matthijs, a professor at Johns Hopkins University SAIS and co-editor of the new book, “The Future of the Euro," who relayed the bar metaphor.

Between 1998 and 2007, Greece's annual economic growth per person was 3.8 percent -- the second fastest rate in Europe.

But there were weaknesses within.  The booming economy in Greece and other countries such as Ireland and Spain caused prices to rise, and the countries gave generous pay rises to their workers, which made their exports more expensive. That made the countries less competitive, but since they were growing so fast, it didn't matter too much.

Then the financial crisis hit. As economic growth slowed, these countries’ competitive weaknesses and unsustainable debt loads suddenly became glaringly obvious.

“It’s when the tide goes out that you see who’s swimming naked,” Matthijs says.

The lesser known story

Matthijs says there is a lesser known narrative he finds more compelling. Basically, he says, it helps to explain why the bartenders kept on serving.

In the mid-1990s, even before it came into existence, markets made a huge bet that the euro would be a reality. Specifically, investors, many in northern Europe, bet that interest rates in northern and southern Europe would converge. At the time, interest rates in southern Europe were much higher than in northern Europe, simply because people thought investing in countries like Greece was much riskier than investing in countries like Germany.

In anticipation of the euro zone, investors put lots of money in the cheap, high-yielding bonds of southern Europe. That helped to drive down yields and fueled borrowing and an economic boom in southern countries.

Ultimately, investors were right – Greek interest rates on 10-year bonds fell from around 20 percent in the early 1990s to only 3 percent in 2002. “They made a lot of money in the north betting against higher interest rates there. That fueled the boom, before the euro came, that overheated these economies."

As economies overheated, it’s not a surprise that their competitiveness suffered, says Matthijs.

Levy Institute

Bank of Canada,

In short, many in the north pushed for a financial regime that didn't fit the Greek economy, because they personally stood to benefit. Many rightly blame the Greeks for its current crisis, but some of the blame belongs farther north as well, he argues.

Matthijs compares the situation to the U.S. subprime crisis. Who was really at fault for the housing crisis in the U.S.: The subprime borrowers who bought houses they couldn’t afford, or the predatory lenders who encouraged them to take them out?

“The Germans don’t like that comparison. But they were greedy. They wanted the higher yielding bonds there, they wanted to invest there,” he says of southern Europe.

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Greece and Puerto Rico face economic disasters. Here's what you need to know about the defaults and how it will affect the U.S. (Jason Aldag/The Washington Post)