🧠 APHG Models & Theories

Distance Decay

The idea that interaction decreases as distance increases

Gravity Model

Predicts interaction between places based on population and distance

Time-Space Compression

Improved transportation reduces perceived distance

Demographic Transition Model (DTM)

Model showing population change over time as countries develop

Epidemiological Transition Model

Model explaining changes in disease patterns over time

Nation-State Concept

A state whose territory corresponds to a single nation

Self-Determination

The right of a people to choose their own state

Von Thünen Model

Model showing agricultural land use based on distance from market

Bid-Rent Theory

Land value decreases as distance from city center increases

Burgess Concentric Zone Model

City structure in rings from CBD outward

Hoyt Sector Model

City development in wedge-shaped sectors

Multiple Nuclei Model

City with multiple centers of activity

Galactic City Model

Modern city with edge cities and highways

Central Place Theory

Explains location and size of cities based on services

Rank-Size Rule

City sizes follow a predictable distribution

Primate City Rule

Largest city dominates country economically and politically

Rostow’s Stages of Development

Model of economic growth through stages

World Systems Theory

Divides world into core, semi-periphery, and periphery

Comparative Advantage

The ability to produce goods more efficiently than others