Bolivian Spanish word
caserita / casero
Meaning: the warm market address term for a vendor (or a customer)
How it is used in Bolivia
In highland markets vendor and customer often call each other 'caserita/casero', a warm term for a regular. Using it, in usted, keeps a repair friendly rather than transactional.
Learn it in a real situation
Culture, Markets and Money in Bolivia, Practical Spanish