For habitual lobbyers, past lobbying should be much more important to the extent that it may be the only significant determinant of current lobbying for that group.
Overall, a quick scan of the data suggests that lobbyers are larger, more concentrated in steel production, and have invested less in modernizing their plant and equipment.
In the one-pool model, lobbyers tend to be larger firms that are more concentrated in steel production and that have declining market performance and low levels of investment in productivity improvements.
K = 2), our firms appear to cleanly sort themselves into habitual and occasional lobbyers.
We hypothesize that the first pool contains habitual lobbyers and the second contains occasional lobbyers.