把商品生产、计划经济、经济改革放到一起来研究,是个新课题。突破老框框,结合新的实践经验来研究它们,认识它们,弄清它们之间的内部联系,是很必要、很有实际意义的。商品生产从一定意义上讲,人类社会已知的经济形式大体有三种:自然经济、商品经济和产品经 Putting commodity production, planned economy and economic reform together to study is a new topic. It is necessary and significant to break through the old framework and study them with new practical experience to understand them and understand the internal relations among them. In a certain sense, there are basically three types of economic forms known to mankind: the natural economy, the commodity economy, and the product economy