求翻译：凯恩斯认为，由于存在“三大基本心理规律”，从而既引起消费需求不足，又引起投资需求不足，形成有效需求不足，导致了生产过剩的经济危机和失业，这是无法通过市场价格机制调节的。最好办法是政府干预经济，采取赤字财政政策和膨胀性的货币政策来扩大政府开支，降低利息率，从而刺激消费，增加投资，以提高有效需求，实现充分就业。是什么意思？

Keynes argued that due to the existence of three basic psychological law ", which not only caused by the lack of consumer demand, but also caused by lack of investment demand, the formation of a lack of effective demand, resulting in the overproduction of the economic crisis and unemployment, which

Keynes argued that, due to the fact there are 3 " " the basic psychological laws that give rise to consumer demand, and low investment demand, a lack of effective demand, which led to the overproduction of the economic crisis%