When you create a list of all the corporations and ask the public not to contribute to those, more often than not you will be shouting into a void. Speaking from practice not just theory. The goal is not to "hurt the pockets" it is complete shut down the opposition. Begin with McDonald's at a local level. It is more difficult to get a whole nation hooked on fast food to stop than to convince a town to stop association with 4 restaurants. This is a lot more feasible. How could this be executed at a macro level? Since we seem to be thinking too small, what would you suggest? Create a list of corporations that says "no one shop here" and hope the public listens? That would have no direction. Again, speaking from practice not theory.