Exercise 1 solution

(a) A shop assistant becomes a manager after ten years: class-like (achieved status, movement is possible). Intragenerational, because it happens within one person's working life.
(b) The daughter of a miner becomes a surgeon: class-like, and intergenerational, because her position is compared with her parent's. It is upward mobility.
(c) A position fixed at birth for life: caste-like. The Social stratification page says that in caste systems "all aspects of social status are ascribed, such that one's social position at birth persists throughout one's lifetime". There is no mobility to classify.
(d) A surgeon's son becomes a surgeon: class-like, intergenerational, but no change of position, so it shows the same level rather than movement.

Least evidence of mobility: (c) and (d). In (c) the system forbids it; in (d) the child ends where the parent was. (This is a reading of the chapter's definitions; the case (d) could still reflect real effort, which the example does not tell us.)