First come, first served? Speed and fairness in online sales

The principle of first come first served (FCFS) has been the default mechanism for selling scarce goods since time immemorial. Cinema queues, restaurant seating, buying tickets for sports games, the principle appears self-evidently fair: whoever arrives first receives service first. The logic seems equally applicable to online sales, where digital queues replace physical lines. But the truth is a little more complicated.

When people compete for resources online rather than in person, they don’t form crowds or camp outside, solving the logistical problems that FCFS was designed to address in the physical world. They also do not make the same personal sacrifice to secure their position – staying up until midnight to click a button is not the same as camping outside a bookstore or concert venue. Even as online sales queues eliminate some inconveniences of physical queuing, they can cause new forms of unfairness.

Deciding order in a digital queue

The central problem with online FCFS lies in what it actually measures. A physical ticket  queue imposes real costs on participants: time away from work, lost sleep, exposure to the elements, physical discomfort. These opportunity costs create a rough equilibrium where dedication is rewarded with priority, and most people consider this fair. Online environments eliminate these natural barriers, and differences in performance mean the first person to click may not be the first to receive a ticket.

In digital spaces, FCFS primarily rewards technical advantages rather than commitment or need. Internet connection speed, computer processing power and geographical proximity to servers determine who reaches the front of the queue. Someone with fibre broadband and a high-performance computer has a structural advantage over someone using mobile data on an older device, regardless of how badly either wants or needs the product, or in many cases who physically attempts to buy the product first.

The bot problem

Virtual waiting rooms with ‘first in first out’ queuing discipline identify visitors with timestamps and assign unique, sequential queue identifiers, throttling access based on controlled inflow rates. However, automated programmes exploit the speed advantage inherent in FCFS far more effectively than any human could.

Sophisticated bots can monitor websites continuously, react to sale announcements in milliseconds, and complete checkout processes faster than humanly possible. Where physical FCFS rewarded those willing to queue overnight, digital FCFS rewards those with the most efficient automated systems. The arms race between sellers implementing bot detection and buyers developing more sophisticated automation continues to escalate, with legitimate customers caught in the middle, and tout or resale websites the main beneficiaries.

The perception gap

High profile ticket sales disasters create media coverage and even in some cases political controversy. Most consumers traditionally view FCFS as the ‘fairest’ system, whether it involves physical or online queuing.

When physical queues operate on FCFS principles, participants can observe the process directly. They see who arrived when, can verify that no-one cuts in line, and understand their position relative to others. Online FCFS provides no such visibility into the factors determining queue position. Users cannot see whether they lost out due to network latency, server response times, or automated competitors. This opacity undermines the very transparency that makes FCFS feel fair in physical spaces.

The problem intensifies during high-demand events. When thousands attempt to access a sale simultaneously, small variations in connection speed or server routing can determine success or failure. The participant who refreshed their browser one second later may attribute their loss to bad luck, unaware that systematic technical disadvantages played the decisive role.

Alternative approaches

The limitations of digital FCFS have prompted exploration of alternative allocation methods. Randomised systems offer one approach, though they introduce their own complexities. Random lottery allocation can spread network traffic across a registration window rather than concentrating it at one moment, whilst giving every eligible participant equal chances regardless of technical capabilities.

Pure randomisation, however, removes any reward for promptness or dedication. Some hybrid systems attempt to balance these concerns by randomising access only amongst those who arrive within a specified window before a sale begins. This approach eliminates the speed advantage whilst still rewarding those who plan ahead and arrive on time.

Businesses can implement systems that place early arrivals in holding areas with countdown timers, then assign completely random queue positions when sales begin, removing advantages from bots and fast internet connections whilst delivering fairness without requiring extended waiting. These mechanisms strip away the technical advantages whilst maintaining visible, transparent processes that users can understand and trust.

The cost of perceived unfairness

If people get their tickets, why does fairness even matter? Aside from the high-profile controversies over large events, businesses now operate in an environment where social media, forums and other spaces amplify brand trust issues with great speed. Operators with a near-monopoly can afford to ignore criticism over fairness, but if enough customers and potential customers feel disadvantaged, this creates a problem.

Social media amplifies these perceptions. A customer who believes they lost access due to an unfair system may abandon that retailer, they are also likely to share their frustration publicly, influencing others’ perceptions and purchasing decisions. Complaints about allocation can go viral, and systems perceived as systematically unfair can generate reputational damage far exceeding the value of the immediate transaction.

Conclusion

First come first served remains a useful principle for many online transactions, particularly where demand rarely exceeds supply. However, for high-demand events where allocation decisions matter greatly to customers, FCFS puts in sharp relief the characteristics of online sales that physical queues do not share. The speed advantages it rewards in digital spaces often reflect technical infrastructure rather than customer dedication or need. Alternative approaches, including randomised systems, are one alternative that can protect businesses from reputational damage or mass losses of genuine sales to bots. Online sales aren’t the same as in the real world, and the principles of fairness that apply in one place don’t necessarily work elsewhere. Ultimately, the problem isn’t an abstract debate over whether FCFS is fair, but whether a system is perceived to be fair and transparent, and whether it can protect the reputation of the sales platform whilst still delivering its function.