This study: http://scholarworks.boisestate.edu/cgi/viewcontent.cgi?article=1013&context=itscm_facpubs indicates that sellers don’t trust email communication as much as face-to-face communication.
This study: http://www.coppead.ufrj.br/upload/publicacoes/05983421_1.pdf recommends avoiding an unreasonably low offer as that can kill the negotiation.
This study: http://scholarworks.boisestate.edu/cgi/viewcontent.cgi?article=1013&context=itscm_facpubs indicates that sellers don’t trust email communication as much as face-to-face communication.
This study: http://www.coppead.ufrj.br/upload/publicacoes/05983421_1.pdf recommends avoiding an unreasonably low offer as that can kill the negotiation.