Siying's mother and father both lacked any formal education and supported their family by working as shoe shiners in a New York City subway station. Siying got a scholarship to attend an Ivy League university, went to medical school, and is now a neurosurgeon at a hospital in Boston. This is an example of:

vertical social mobility.

Explanation:

Vertical social mobility is a situation when a person move either up or down within a social hierarchy.

In most societies, vertical social mobility is heavily influenced by 2 factors: ownership of Resources and influence. Having more of either of these factors will make a person move up within the social hierarchy, and vice versa.

In the example above, Siting move from the daughter of a shoe shiners into a Neurosurgeon. Her job as a neurosurgeon most likely provided with more salary and influence compared to her shoe shiners parents. This means that she experience an upward move within the social hierarchy.

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