The authors examine supplier switching decisions using a unique database that tracks firms (credit unions) and their suppliers (data processing vendors). Results suggest that both CU and vendor characteristics are important determinants of buyer-supplier relationships.
Link
http://econpapers.repec.org/scripts/redir.pl?u=http%3A%2F%2Fwww.chicagofed.org%2Fpublications%2Fworkingpapers%2Fwp2005_22.pdf;h=repec:fip:fedhwp:wp-05-22