Anyone introduced to the M.H. business immediately realizes the variety of niches of which it is comprised.
Each of these niches serves different goals and requires a separate set of specifically learned skills for their successful application.
The M.H. business, like others, is dynamic; it changes over time and requires the entrepreneur to adjust to new challenges without diminishing the constants of supply and demand, cause and effect, and so on. The economy for the business, as Lonnie says, is fundamentally a local affair, although macro-economic forces do affect all of us, as well as do the opposing forces of the public and political interest of elected leadership.
I understand that, generally, the business has changed over the last 5, 10, 15 years. What is different today? What has changed, and what will it probably be like in 5, 10, 15 years from today? This is a muse worth her weight in gold.