Zelinsky' propounded :

Question

Accepted Answer

Zelinsky propounded the Mobility Transition Model. Here's why that's the correct answer and why the others are incorrect:

*   **Option 3: Mobility Transition Model (Correct)** Wilbur Zelinsky is indeed known for his **Mobility Transition Model**. This model, developed in the 1970s, describes the changes in migration patterns that occur as a society develops and modernizes. It links migration trends to the demographic transition model and stages of economic development. The model outlines how the type and intensity of migration change as a country moves from a pre-industrial to an industrial and then to a post-industrial society. It specifically addresses changes in international and internal migration, rural-to-urban migration, and overall mobility rates.

*   **Option 1: Steady State Theory (Incorrect)** The Steady State Theory is a cosmological model concerning the universe's expansion and creation of matter. It's not related to population studies or migration patterns, and Zelinsky is not associated with it.

*   **Option 2: Demographic Transitional Theory (Incorrect)** While Zelinsky's Mobility Transition Model is *related* to the Demographic Transition Model, he did not propound the Demographic Transition Theory itself. The Demographic Transition Model describes the shift in birth and death rates as a society develops, and is associated with the work of Warren Thompson and Frank Notestein, among others. Zelinsky's model builds upon this by examining how migration patterns change alongside these demographic shifts.

*   **Option 4: Optimum Population Model (Incorrect)** The Optimum Population Model deals with the ideal size of a population that maximizes per capita income or welfare. While population size can influence migration, the Optimum Population Model is a distinct concept, and Zelinsky's work is not primarily focused on determining the ideal population size. His focus is on the *patterns* of movement.