Are there too many A+ students?

Harvard University recently capped the number of As received by undergraduates in an effort to curb grade inflation. In Canada university admission averages have been climbing for years. There's been a surge in A+ high school students. Do grades still reflect merit? We hear from Christopher DeLuca, professor of educational assessment at Queen’s University, and Darja Barr, a senior instructor in mathematics at the University of Manitoba who has studied the connection between high school grades and achievement in first year university.