Trust is morally basic. It makes cooperation between persons, to whatever degree, possible. In Chapter One, I define trust as being the relation between people bound by genuine goodwill, competency and vulnerability to each other. ;In Chapter Two, I criticize Thomas Hobbes's understanding of society as founded upon a social contract which exclusively self-interested persons have reason to make in order to escape from the state of nature. I argue that on Hobbes's assumptions about the nature of persons, such a (...) contract cannot be viable. Without the assumption that, prior to the contract, persons have some reason to trust one another, no contract can be expected to be made or survive. ;David Gauthier, who presents a contemporary version of Hobbesian social contract theory in his Morals by Agreement, is vulnerable to a similar argument. In Chapter Three, I argue that given Gauthier's description of persons there does not exist the trust necessary to construct, even hypothetically, the social contract. ;Chapter Four examines the very basic role which trust plays in both personal and civic friendship. I argue that trust is what distinguishes "end friendship" from the instrumental friendships in which we are "used" or taken advantage of by others. I discuss civic friendship and argue that the trust which is basic to it, namely social trust, is a form of trust which can exist between people who are otherwise strangers to one another. ;In Chapter Five I go on to prescribe trust. I argue first, that we should never be untrustworthy, as this implies treating people instrumentally, and hence violates Kant's Categorical Imperative. I argue, however, that we should not always trust, maintaining that trust, for normative purposes, is best understood as an Aristotelian mean, and can be described by the extremes of naivete and cynicism and that we should trust in a way which avoids both these extremes. (shrink)