琼·罗宾逊的增长率理论,是把凯恩斯的短期理论长期化。她受哈罗德的影响虽则很大,但不赞成应用哈罗德的理论。罗宾逊模式中有规则的积蓄率相当于哈罗德的“有保证的增长率”,在形式上有同一性,但在内容上却有所不同。在罗宾逊的动学中,“有规则的积蓄模式”本身并无多大重要性,她是以此模式为中介来分析不规则的现实的经济发展为其理论重点。罗宾逊所设想的资本主义经济模式,首先考察最简单的场合,即一种生产技术之下的资本积蓄。罗宾逊关于实际工资与利润率的命题是:“如果技术是一定的,则实际工资水平依存于资本积蓄率。”以及“如果实际工资水平是一定的,就决定了每个劳动者的赏本价值和对资本的利润率。”罗宾逊分析劳动和资本的长期相互依存关系时指出,如果技术水平一定,从长期来看,资本积蓄率不可能超过劳动力增长率。至于垄断形成和影响,罗宾逊则认为,企业家由缔结垄断协定,使物价比货币工资相对提高,从而可能增加从每个雇佣劳动者取得的利润。罗宾逊对于技术进步的引用问题,首先设想可能利用的技术只有一种,并假定劳动力的增长率为一定。她提出中立的技术进步的概念,意思是说,随时间的推移,一定劳动时间的生产量,在所有经济部门,以同一比率增加。在“通论的一般化“中,罗宾逊以“资本的充分利用增长率”为中心,考察了“有规则的积蓄模式“。她认为,“经济的可能增长率,即能长久维持扩展的最高率,是同劳动力增长的百分率与每个劳动力生产量增长的百分率之和相近。” The growth theory of Joan Robinson is to long-term Keynesian short-term theory. Her influence by Harold was great, but not in favor of Harold’s theory. The regular savings rate in Robinson’s model is equivalent to Harold’s “guaranteed growth rate” and is formally identical but somewhat different in content. In Robinson’s motion, the “rule-based savings model” is not of much importance in itself. She takes this model as an intermediary to analyze the irregular reality of economic development as its theoretical focus. The capitalist economic model envisioned by Robinson first examines the simplest scenario, a kind of capital accumulation under production technology. Robinson’s thesis about real wages and profit margins is: “If the technology is fixed, the actual wage level depends on the capital accumulation rate.” And “if the actual wage level is fixed, the value of the reward for each worker is determined And the rate of return on capital. ”When analyzing the long-standing interdependence of labor and capital, Robinson pointed out that if technology is at a certain level, in the long run, the rate of capital accumulation can not exceed the growth rate of the labor force. As for the formation and influence of monopolies, Robinson argues that entrepreneurs may increase profits from each hired laborer by concluding a monopoly agreement that causes prices to rise relative to money and wages. Robinson’s reference to technological progress first assumes that there is only one possible technique to be employed and assumes that the growth rate of the labor force is constant. She proposed the notion of neutral technological progress, meaning that over time, the output of a given working hour increased in all economic sectors by the same rate. In Generalization of General Theory, Robinson examined the “regular savings pattern” centered on “the rate of full use of capital.” She argues that “the possible rate of economic growth, the highest rate that can be maintained for long, is similar to the sum of the percentage increase in the labor force and the percentage increase in each labor force output.”