The study formulates a very general model to make statements about a very broad range of businesses. The survey, centred on the dynamics of development activities, reaches the conclusion that the trend in development and investment activities is not necessarily downward, as many theoretical studies and empirical examinations have sought to show. The author also makes an important point about changes in products and product models: the growth predicted by the economic mathematical model for development intensity shows that the accumulated productivity and quality knowledge should have been passed onto new products. It is also interesting to find how much the profit from productivity knowledge has to give way to the consumer, and how the producer and the consumer have to share the costs of quality
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