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Debt sustainability is a vexing issue. Its importance is immediately obvious but it escapes any easy definition. This situation is not unheard of in economics; price stability and full employment are examples of other crucially important policy objectives that cannot be simply defined. Yet, while price stability or full employment can both be measured with a reasonable degree of precision, debt sustainability cannot even be measured directly.
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Charles Wyplosz (2011) studied this question.
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