Why your group chat can't decide where to eat

Only one person can talk at a time

In a classic 1987 paper, Michael Diehl and Wolfgang Stroebe asked why brainstorming groups come up with fewer ideas than the same number of people working alone. Across four experiments, they found that waiting for your turn to talk accounted for most of the gap. While one person holds the floor, everyone else's ideas wait, and an idea you can't say right away may be forgotten or quietly dropped.

Their groups were talking face to face, but a group chat has a queue of its own. The first few messages set the topic, and by the time the quieter people pick up their phones, the conversation has already moved on without them.

The first idea pulls the rest toward it

Hearing other people's ideas changes your own. In three experiments published in Applied Cognitive Psychology, Nicholas Kohn and Steven Smith found that when people exchanged ideas, their suggestions conformed to the ideas others had offered, and they explored a narrower range of options. They called it collaborative fixation.

In a dinner thread, that looks familiar. Once someone asks "what about the Italian place?", the next suggestions tend to circle it: another Italian place, somewhere on the same street. The ramen someone was quietly craving never comes up.

Groups go along with plans nobody wants

In 1974, management writer Jerry Harvey described an afternoon when his family drove a long, hot road to Abilene for dinner at a cafeteria. Afterwards, one by one, they admitted that none of them had really wanted to go. Harvey called it the Abilene paradox: a group can take an action that contradicts what each person in it actually wants.

Part of the reason is what people believe others think. In four studies of college students, Deborah Prentice and Dale Miller found that students believed they were more uncomfortable with campus drinking than the average student was, a gap the researchers found to be illusory. Psychologists call this pluralistic ignorance: everyone privately doubts, and everyone assumes the others are fine.

In a group chat, it's why "anywhere is fine" can mean "I'd rather not, but I won't be the one to say so." Each person thinks the others are happy with the plan, so nobody objects, and the group heads to its own Abilene.

What helps

None of this means groups make bad choices. It means the order of the conversation matters. A few changes help:

• Ask before anyone suggests. Collect what each person wants before a single place is named, so the first idea can't set the direction.
• Ask each person on their own. People say what they really want when they aren't answering in front of everyone.
• Make saying no easy. A no that nobody else sees costs nothing, so people actually say it.
• Then compare. Look at everyone's answers together and find the places that suit the whole group, not the loudest voice.
• Vote on a short list. A handful of good options gets decided; an open thread rarely does.

How MiBA helps

MiBA takes the first round out of the chat. One person starts a gathering and shares one link. Everyone answers a few questions on their own: what they feel like eating, the vibe, the budget and what they don't eat. You see what the group would love only after you've answered, so nobody copies the first voice. Your no's, your diet and your budget stay private.

MiBA weighs every answer against real restaurants and ranks them, the host puts up to five on a short list, and the group votes. Then you get a link to book, and everyone hears where and when.

Group decisions. Sorted.