Consider the following factors regarding an industry: I. Capital investments II. Business turnover III. Labour force IV. Power consumption. Which of these determine the nature a size of the industry?

Capital investments determine the scale of operations and the level of technology employed (capital- intensive vs. labour-intensive). Labour force indicates the human scale of the industry and its labour intensity. Power consumption is a significant factor for many industries, indicating energy intensity and scale of operations, particularly in manufacturing. These three factors collectively provide strong indicators of both the scale ("size") and the fundamental resource mix ("nature") of an industry.