Proxemics (from the Latin approximare = to approach) deals with people's spatial behavior as part of non-verbal communication.
The choice of the place of negotiation in sales, ie who comes to whom? Anyone who wants something from someone must enter their territory.
The seller's territory is violated by the seller if he places a personal item such as his briefcase on his desk.
Maintaining physical distances in the sales pitch. Too little or too much distance disrupts the relationship between seller and customer (distance zones).