In this video, Motley Fool financial analysts Matt Koppenheffer and David Hanson discuss American Capital Agency's (AGNC -0.22%) decision to sell up to 57.5 million common shares, worth approximately $1.8 billion. Matt tells us that when you look at a mortgage REIT, the only way it differentiates itself from the competition is through the competence of its management. Though a move like this does return capital to shareholders, as the company recently bought back shares in November at a premium to what they are selling these shares for now, a transaction like this isn't free. The loss American Capital is going to take on this sale has to make investors wonder if management is really making the best decisions for the company.