The document describes two models of healthcare delivery - the regionalized model and dispersed model. The regionalized model concentrates specialized services in regional centers, while the dispersed model provides basic services locally with specialized care referred out. The US primarily uses the dispersed model due to concerns about access in rural areas. For a scenario where an elderly person experiences chest pain, under the dispersed model they should see their local doctor to be referred to a specialist, while under the regionalized model they would go directly to the specialized hospital.