Gender, age, ethnicity, level of interest, general idea of pedigree (e.g. accent and vocabulary), ballpark of income based on accoutrements, possibly informatio

Gender, age, ethnicity, level of interest, general idea of pedigree (e.g. accent and vocabulary), ballpark of income based on accoutrements, possibly information about your family situation (wedding ring, kids), what kind of car you drive, apparent level of sophistication in relation to the business — and in most cases you can casually ask visitors questions without disrupting the transaction.