The reason a currency without symbols raises spend

A restaurant prints its menu without currency symbols or decimal points: Steak 42, Salad 18. Average spend rises compared with identical menus that include the local currency sign. The prices are identical; the symbols that made them feel like money are absent.

What everyone sees

The omission looks like a design choice — a cleaner, more elegant menu. Diners may notice the absence of the sign but assume it makes no difference, because they know what 42 means. Knowing is not the same as feeling, and the feeling is what the menu changed.

What is actually happening

Yang, Kimes and Sessarego found that diners spent more when menus omitted the dollar sign, controlling for other factors. Prelec and Loewenstein described the pain of paying: the felt cost of a purchase, which varies with the salience of the price. A currency symbol makes the number explicitly monetary, which activates the pain-of-paying mechanism. Without the symbol, the number is still understood intellectually but is less viscerally connected to the idea of spending money, and the reduction in felt cost increases willingness to order.

Why it stays hidden

The mechanism hides because the diner’s knowledge has not changed. They still know 42 means forty-two dollars. But knowledge operates in one system and the pain of paying operates in another, and the symbol is a cue that bridges the two. Removing the cue leaves the knowledge intact and weakens the bridge, which is why the diner spends more without feeling less informed.