In the back of the Berliner Republik bar on the banks of the river Spree, Matt, Otto and Christian’s eyes are fixed on a screen in front of them. The names and prices of 18 German draught beers flash up, bright green on a black background, and change every few seconds, according to who has ordered what.

It’s a pub game for the modern age, based on supply and demand. The trick is to buy the beer cheaply and then give yourself a pat on the back when demand pushes the price up.

“It gives a bit of a risqué edge to ordering,” says Otto, a graphic designer. “But it also makes you feel strangely vulnerable.”

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