Yet an actor in a Cameron Crowe film must be prepared to do things that fly in the face of conventional narrative: his characters are forever
addressing the camera and declaiming their innermost thoughts in voice - over, the
cumulative effect of which is an anything - can - happen atmosphere and characters of substance etched in lightning - quick vignettes.
Problems such as homelessness that have long developmental trajectories, are perhaps best understood from models of
cumulative adversity and amplification of risk.32, 33 Based on life course development and social learning theory, the risk amplification model
addresses mechanisms through which experiences on the street amplify negative developmental
effects originating in the family.