Please don't try to spread the idea that it "does not work", it's incorrect and discourages one of the most effective non-violent mechanisms consumers have for driving change in market economies. It may not necessarily be sufficient (coordinated boycotts, for instance, are much more effective than individual decisions), it may not always be an option (particularly when there aren't viable alternatives), it may not work immediately, there may not be enough people who "vote" a certain way, and there may be insufficient information to make informed decisions--but consumers absolutely decide which products and companies live and die, and every single dollar you spend allocates power.