Final answer:
The statements about household income affecting neighborhood differentiation and a GIS combining physical and spatial geography are true. The statements about consumer mobility decreasing trading area size and market saturation being referred to as 'overstored' are false and true, respectively.
Step-by-step explanation:
The first statement about household income being the determining factor for differences between neighborhoods is true. It is well-established that neighborhoods often house people of similar social standing and that wealthy families do not usually live next to poorer families. This segregation by income affects various aspects of a community, including crime rates, access to services, and overall living conditions.
For the second statement, as consumer mobility increases, it is false that the size of a store's trading area will decrease. Instead, greater consumer mobility usually leads to an expansion of a store's trading area since consumers are willing to travel farther to shop.
The third statement is true. A Geographic Information System (GIS) is indeed a computerized system that combines physical and spatial geography, allowing for the analysis and display of spatially referenced data.
Finally, the last statement is also true. When a market has too many stores for the available consumer base, leading to reduced profits for businesses, it is indeed referred to as being 'overstored'.