What can the little guy do?

You can tell who has the power in a civilization buy looking for the most elaborate buildings. The government in Roman times, many examples still exist ie the coloseum. The Roman Catholic Church in the middle ages ie many gothic churches speread throughout europe. In our present day it is the corporations, as our public buildings crumble corporations like the oil industry and pharmacutical companies record record profits. these corporations are owned by shareholders and are therefore profit driven.No profits = angry shareholders. Unfortunately this system is money driven and morals are generally not considered. How do we engineer a paradigm shift?