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At first, I don't know what the sovereign debt actually means. I guess it means one country borrows money from foreign countries with the government power as a collateral security, and if it defaults, it is really terrible because maybe some government power will be taken over by foreign countries. So I'm very surprised to find that so many western countries are at the verge of default of sovereign debts.
I think it over and over and check the definition in the cyclopedia. Here are the definitions:
What Does Sovereign Debt Mean?
Bonds issued by a national government in a foreign currency, in order to finance the issuing country's growth. Sovereign debt is generally a riskier investment when it comes from a developing country, and a safer investment when it comes from a developed country. The stability of the issuing government is an important factor to consider, when assessing the risk of investing in sovereign debt, and sovereign credit ratings help investors weigh this risk.
Investopedia explains Sovereign Debt
An unfavorable change in exchange rates, and an overly optimistic valuation of the payback from the projects that the debt is used to finance, can make it difficult for countries to repay sovereign debt. The only recourse for the lender is to renegotiate the terms of the loan - it cannot seize the government's assets. A country that defaults on its sovereign debt will have difficulty obtaining a loan in the future.
Then, the default can only result in debt restructuring. Maybe the impact brought to the rest of the world is only the govenment's competence and hence the borrowers' leading position and credit worthiness in global markets, if the lenders are not desperate for the money back.