在短期，总供给曲线是水平的。？在长期，总供给曲线是垂直的。
In the short run, the aggregate supply curve is flat. In the long run, the aggregate supply curve is vertical.
钾肥进口占了国内总需求的一半以上。钾肥供给长期依赖于进口，重蹈铁矿石覆辙的可能性很大。
Potassium fertilizer supply has long term dependence on import and the possibility of repeating the iron ore mistake is very high.
本文利用协整关系检验和向量自回归模型，从短期波动和长期均衡角度，描述和检验了国外总需求和总供给对中国经济增长的拉动作用。
By using the cointegration testing and vector autoregression models, we examine the long-run equilibrium and short-run fluctuations in the growth-led roles of foreign aggregate supply and demand.
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