We work with many vendors in the book industry, and we've seen all sorts of personalities, styles, business practices and policies. Sure we've seen our share of bad eggs, but in most cases, we have had great relationships with our vendors. This has given us many advantages over other publishers -- not the least of which are low prices, superior information, and great customer service. Our strong vendor alliances are no coincidence -- we've learned over the years how to cultivate these partnerships for the most mutual benefit. To help you forge the path to strong vendor relationships, here are four critical but common mistakes to avoid when dealing with vendors.