english: An example of a great psychological idea: the single best improvement in passenger satisfaction on the London Underground, per pound spent, came when they didn't add any extra trains, nor change the frequency of the trains; they put dot matrix display boards on the platforms -- because the nature of a wait is not just dependent on its numerical quality, its duration, but on the level of uncertainty you experience during that wait.
non_english: Jedan primer odlične psihološke ideje: jedinstveno poboljšanje zadovoljstva putnika u londonskoj podzemnoj železnici nije došlo jer je povećan broj vozova i njihova učestalost, već zato što su postavili matrični displej na platformama. Priroda čekanja je takva da ne zavisi samo od svoje brojčane vrednosti, trajanja već od nivoa nesigurnosti koji doživljavamo dok čekamo.