Let’s put this bookseller merger in perspective by Dan Primack @FortuneMagazine December 6, 2010, 8:29 PM EST E-mail Tweet Facebook Google Plus Linkedin Share icons That Barnes & Noble is in play is no big shock. What’s strange, however, is how much so many of us seem to care. Today’s big M&A news comes from the world of brick-and-mortar bookstores, as Borders BKS has offered to merge with larger rival Barnes & Noble BKS . More specifically, Borders shareholder Pershing Square Capital Management — a hedge fund managed by William Ackman — would finance a $16 per share acquisition (20% premium to Friday’s closing price). Shares of both companies jumped on the news, with Borders up 32% and Barnes & Noble up more than 12% as of the time of this writing. That Barnes & Noble is in play is no big shock. The company announced plans to evaluate strategic options back in August, and a number of private equity firms are said to have kicked the tires. What’s strange, however, is how much so many of us seem to care. Not just media folks like me, but also media consumers like you (unless this post is your browser homepage). After all, it really doesn’t matter much in the grand scheme of book-buying or book-selling. Ackman’s offer would value Barnes & Noble at approximately $960 million. If you add in the current Borders market cap, we’re just over $1.6 billion. And, to be extraordinarily generous, let’s round that up to an even $2 billion due to post-close synergies and the possibility of shareholders pushing for a premium on the premium. Moreover, we’ll forget that most Barnes & Noble locations are leased (over 400 are up by April 2014), which means that any commercial real estate revival could sink the company’s profit margins. So how would the merged bookseller match up against its main rival, Amazon.com AMZN . As of market open today, Amazon was valued at more than $79 billion. Or, put another way, around 40x the size of Borders and Barnes & Noble combined (based on my estimate) — or around 50x the current combined book value. Under normal circumstances, a company’s stock would fall on news of two other rivals merging. But Amazon actually has ticked up more than a point today. Guess that’s because Amazon shareholders no longer consider Borders and Barnes & Noble to be serious competition… whether alone or together.