Talks between Honda Motor and Nissan Motor for a potential merger, a multi-billion deal that would have resulted in the creation of the world’s fourth largest automaker in terms of vehicle units sold, have collapsed. There could be three key reasons why: One, the merger, proposed in December, was never a deal between equals, though there was pressure to portray it as one. Honda had started the negotiations from a position of strength, given that it is a popular brand globally and sells way more cars than Nissan. Nissan, on the other hand, is ailing and desperately needed the merger...