Final answer:
Zachary's move is an example of pull factors in migration, as he is attracted to the new country by the prospect of great teaching jobs, rather than escaping negative circumstances at home.
Step-by-step explanation:
The scenario provided about Zachary moving to a new country for teaching jobs is an example of pull factors at play in migration. Pull factors are positive attributes of a destination that attract people to move there, such as economic opportunities, better living conditions, or freedoms not available in their home country. In Zachary's case, the great teaching jobs available in the big city act as a pull factor, drawing him to the new country. There is no indication in the text of a push factor, which would suggest that he is escaping a negative situation in his original country. Instead, the emphasis is on the attractive opportunities that the big city has to offer, confirming the classification of his reasons as a pull factor.