But the new rules obviously require a strong institution to interpret them, and whose judgment is accepted by everybody. Though checking whether a budget is below the SGP’s ceiling of 3% of GDP may be a straightforward matter, there can be reasonable disagreement about whether the business-cycle adjustment should be estimated at 0.5% or 0.8% of GDP, or whether a country is adhering to its medium-term expenditure objective.
但显然，新规则需要强大、决定可以被所有人接受的机构来解释。检查预算是否低于SGP的上限——GDP的3%也许是个简单的任务，但对于商业周期调整应该算作GDP的0.5%还是0.8%的问题，或者一国是否遵循其中期支出目标的问题，仍会引起合理的分歧。