
A. Because debt service is the difference between the passive and structural deficits. The larger the difference between the two, the greater the burden of the debt on the economy.
B. Because interest payments are the result of past expenditures and do not result in additional productive expenditures. They are the burden of the debt: if the debt service is large and is hurting the government’s ability to fund today’s expenditures, that debt could be considered a problem.
C. Because debt service determines the real deficit. The higher the real deficit, the greater the burden of the debt on the economy.
D. Debt service is not an vital measure of whether debt is a problem. Only debt/GDP ratios and future budget balance projections are relevant measures of the burden of the debt on the economy.
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It is for debt in infrastructure.