As yet another key debt payment date closes in on Puerto Rico, here's a primer on what you should know, and who it will affect the most ahead of the deadline. Q: If the Puerto Rico Public Finance Corporation (PFC) doesn't pay bondholders on Aug. 1, will it be considered a default? A: Yes. According to Moody's vice president and senior credit officer, Ted Hampton, if there is no payment made on Friday, it will be the first default of a U.S. state, or state-like entity, since Arkansas couldn't make its bond payments during the Great Depression in 1933. Q:...