在他于1994年出版的《结构性低迷》一书中，他雄心勃勃的试图给出一个自然率失业演化的一般理论。
His book "Structural Slumps", published in 1994, is an ambitious attempt to provide a general theory of how the natural rate of unemployment evolves.
把周期性原因和结构性原因分开很棘手，在低迷时期可能得出过于悲观的结论。
Sorting the cyclical from the structural is tricky; and excessively gloomy conclusions can be drawn in the midst of a downturn.
农业产业、产品结构性过剩，导致有效需求不足、产品价格低迷；
Unreasonable agricultural production structure leads to the lack of demand of agricultural products and the cheap price of agricultural products;
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