Greece and the United Kingdom have major economic decisions looming on the horizon. Greece must decide whether to default on its debt and exit the eurozone, while Britain must decide whether to leave the European Union.

Politicians in both countries have threatened to follow those severe courses if fellow European nations don't give them what they want.

"Many people regard these threats as a bluff," The Economist's Buttonwood column notes.

"They think that Greece does not really want to leave the euro, and that David Cameron, Britain's prime minister, does not want his country to exit the EU."

The thinking is that Greece will ultimately reach an agreement with creditors to continue repaying its debt and Cameron will convince British to vote yes in a coming referendum about whether the nation should stay in the EU.

"But there are risks that neither outcome will turn out as planned," The Economist explains. "In both cases, political leaders are making a risky bet."

Meanwhile, only six years after the end of the worst financial crisis since the 1930s some experts are worried another one may be on its way.

Some are "warning that the global community has failed to learn the lessons of the Greek debt crisis — or even of Argentina's default in 2001, the consequences of which are still being contested furiously in courts on both sides of the Atlantic," writes The Guardian's Heather Stewart.

Some of the concern stems from the soaring dollar, plunging oil prices and the Federal Reserve's preparation to raise interest rates.

The dollar has reached multi-year highs against a range of currencies in recent weeks, oil prices have hit six-year lows and many economists expect a Fed rate move in September.

"We're going to have another financial crisis," Ann Pettifor, director of Policy Research in Macroeconomics, tells Stewart.

"Brazil's already in great trouble with the strength of the dollar; I dread to think what's happening in South Africa; then there's Malaysia. We're back to where we were, and that for me is really frightening."

Borrowing by developing countries soared 40 percent to $17.3 billion in 2013, according to World Bank data.

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