·为跟踪经济表现一GDP(国内生产总值) 和GNP(国民生产总值)提供基础 Provide basis for tracking economic performance -GDP (Gross Domestic Product)and GNP(Gross National Product) ·依靠涉及各个部门的宏观经济模型 Depend on macroeconomic models covering all sectors• 为跟踪经济表现 — GDP（国内生产总值） 和GNP（国民生产总值）提供基础 Provide basis for tracking economic performance – GDP (Gross Domestic Product) and GNP (Gross National Product) • 依靠涉及各个部门的宏观经济模型 Depend on macroeconomic models covering all sectors