  One model that can help us to think about trust in contexts as vast and complex as major SECs is Margaret Urban Walker’s framework of “diffuse default trust” (Walker 2006). In Walker’s scheme, trust relationships occur in environments (i.e., “spaces and circumstances”) that she calls “zones of default trust.” Walker differentiates trust from mere reliance by noting that in a trust relationship between A and B, A not only expects B to do X, but A expects it of B (Walker, 79). And because trust “links reliance to responsibility,” Walker (p. 80) believes that A has a “normative expectation” of B. But she also notes that we are not always conscious of these normative expectations, because they are typically “unreflective and often nonspecific” expectations where “strangers or unknown others may be relied upon to behave in acceptable ways.” Our reliance on the “good and tolerable behavior of others” is at the core of Walker’s notion of “default trust” (p. 85).