Tipping theory, though not new, is in the news lately, in reference to our "recession" (some say "depression"), and how we can get ourselves out of it, whatever we call it.

What is tipping theory? If you've never heard of it, you may research the topic. Then, how would you apply it to any part of our economy? Most important, where does it start? For instance, if you apply the theory to the auto industry, then what would tip new car purchases? Would it be the availability of credit? The number of people employed? Fear, or the lack of it, on the part of consumers?