  Crushed stone, for example, has a density of 100 pounds per cubic foot (lb/ft3), which is 1600 kilograms per cubic meter (kg/m3), which is 1.6 metric tons per cubic meter. Packed earth is about 95 lb/ft3, or 1520 kg/m3.
Harvard Business Review. Harvard Business Review. The Harvard Business Review (HBR) is a general management magazine published by Harvard Business Publishing, a wholly owned subsidiary of Harvard University. It is published 6 times a year and is headquartered in Brighton, Massachusetts.
The MarchâApril 1974 issue of HBR carried an article that reported on Phases I and II of a project sponsored by the Marketing Science Institute and the Harvard Business School. The basic purpose of the project is to determine the profit impact of market strategies (PIMS). The earlier article established a link between strategic planning and profit performance; here, with additional data, the authors come up with a positive correlation between market share and ROI.