In most first-world countries like Japan, the Five Eyes, etc., the norm (whether in terms of officially announced rules at theme parks or people's own sense of morality) is that one is not allowed to jump a queue even if it is to join his family/group in front. (Of course there may be exceptions in extreme cases, such as when a woman has period and has to leave queue for urgent clean up. But in general, if you are not in the queue, or if you have left the queue, you have to start at the back of the queue.) Meanwhile, I have seen Indian and Arabic people send one or a few "representatives" to line up, and when the "representatives" reach the front, many family members cut to the front to join them. Often the people who are brought in are more numerous than the "representatives" themselves! So it's not like 5 people bringing in 1 person; it's more like 1 person bringing in 5 people! I have also seen Russian tourists do that.

So initially I thought this was a First World vs. Second/Third World cultural difference. But then I read somewhere that in Spain, it is considered perfectly acceptable for "representatives" to bring their friends/family into the queue. And Spain is a First World country. So I realized the line is more nuanced and my previous view was too simplistic. So I was just wondering, in which countries is the "no queue jumping to join group" philosophy widely held? And what are the factors that determine whether a country holds this philosophy?

Clarification: I am only talking about queues where the number of participants is directly correlated with the amount of space/resources the group takes up. For example, the more people your group has, the more seats on a roller coaster you take up. This discussion doesn't apply, for example, to queues at train ticket machines (if there is no limit on how many tickets one person can buy), because one representative can buy tickets for the whole group anyway, and even if the rest of the group comes and stands next to the representative, the number of tickets they are buying is still the same, and it doesn't slow others down.

Thank you for your answers.