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For example , debt-to-GDP ratios are generally expressed as percentages : total debt outstanding ( dimension of currency ) divided by annual GDP ( dimension of currency ) - but one may argue that , in comparing a stock to a flow , annual GDP should have dimensions of currency / time ( dollars / year , for instance ) and thus Debt-to-GDP should have units of years , which indicates that Debt-to-GDP is the number of years needed for a constant GDP to pay the debt , if all GDP is spent on the debt and the debt is otherwise unchanged .
 Debt-to-GDP
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Debt-to-GDP