Enhanced transportation infrastructure increases the threshold requirement as people expect higher quality services, with little effect on the range.

Variations in local income and transportation infrastructure do not significantly alter threshold and range values, as they are fixed parameters in central place theory.

Lower local incomes typically reduce the range because consumers have less access to transportation, while the threshold remains the same across different urban areas.

Higher local incomes and efficient transportation lower the necessary threshold and extend the range, allowing people to afford and travel longer distances for specialized services.