Allocation of Labor and Capital in a Box Diagram The top and bottom axes of the box diagram measure the amount of labor, , in the economy, and the side axes measure the amount of capital, . At point A, 0SL units of labor and 0SK units of capital are used in shoe production, and 0CL units of labor and 0CK units of capital are used in computers. The K/L ratios in the two industries are measured by the slopes of 0SA and 0CA, respectively.