With mortgage rates at their highest level in more than two years, the long-awaited boom in mergers and acquisitions may finally be here. But don’t expect sellers to accept just any price. “M&A is picking up,” said Larry Charbonneau, who runs a boutique advisory firm, Charbonneau & Associates. “The big fish want to buy the small ones, but the small ones don’t know if it’s in their best interest to sell yet.” Charbonneau points out...