Tertiary and Quaternary Activities

Teaching in a school, Banking services, Transportation services, Medical treatment

Teaching, banking, transportation, and medical treatment are all service-based tertiary activities. Manufacturing cars is secondary activity, and mining coal is primary activity.

Fixed store establishments, Street peddling, Door-to-door selling, Internet sales

Retail trading involves direct sale to consumers and includes both store-based (fixed establishments) and non-store methods (street peddling, door-to-door, internet). Wholesale trading is bulk business, not retail.

Kilometer distance, Time distance, Cost distance

Transport distance is measured as: kilometer distance (actual route length), time distance (time taken to travel), and cost distance (expense of traveling). Population distance is not a measure of transport distance.

Mobile telephony and satellites

Mobile telephony and satellites made communications independent of transport by allowing instant transmission of messages without physical movement of mail or documents.