: Modern couriers are often managed by "black-box algorithms" that handle dispatching, tracking, and performance evaluation, which can lead to high-pressure environments [12, 34].
: High-pressure delivery schedules can lead to traffic violations and increased injury rates [27].
While the technology behind delivery continues to advance, the human element—the speed, reliability, and local knowledge of the individual courier—remains the indispensable core of modern trade [8, 21].
Historically, the term "courier" has described various vital roles, from the "kashariyot" who acted as lifelines during the Holocaust to modern-day specialized gamete couriers who transport sensitive biological materials across borders [7, 20]. Today, a courier is defined as a person or company specializing in the direct, secure, and rapid transportation of items from one location to another [8, 35].
Major global players like UPS, FedEx, DHL, and Amazon Logistics dominate the traditional shipping landscape, often utilizing a "hub and spoke" model for international reach [29, 32]. The Rise of the Gig Economy
: Long hours and physically taxing work contribute to high levels of burnout and fatigue [1, 6, 9].