system
Given the following post, respond as if you're commenting on Reddit:
human
Why is Greece weighing so heavily on our economy and the world?

All I keep hearing about is how Greece is affecting everything in the stock market both domestic and abroad, why?
gpt
Everyone is afraid of a chain reaction if Greece can't pay back their debts.

There are a few countries in precarious positions within the Euro: Portugal, Italy, Ireland, Greece, and Spain.

They have all loaned each other money to varying degrees. While Greece is somewhat isolated(most of their money is owed to more stable countries like France and Germany), them defaulting would decrease confidence in the Euro, which would hurt the banks in all the other weak countries.

So the worry is that one defaulting would either directly(via loans they couldn't pay back to an already fragile banking system) or indirectly(via decreased confidence) take out the weaker countries banks.

If enough of the weaker countries default/have insolvent banks, they could (theoretically) take the much stronger banking system in France with them. If France goes down, the Euro in general is fucked.