Common Knowledge, Common Attitudes and Social Reasoning

For as long there have been theories about common knowledge, they exposed to a certain amount of skepticism. Recent more sophisticated arguments question whether agents can acquire attitudes and are needed in social reasoning. I argue that this skepticism arises from assumptions practical reasoning that, considered themselves, at worst implausible best controversial. A proper approach the acquisition their deployment decision making leaves room for attitudes. Postulating them is no worse off than similar idealizations usefully made logic economics.