This researcher wants to get a PhD, but studying will put a dent in his retirement plan

In Alberta, a man we’ll call Dennis, 35, has several careers — one as a researcher in health care, one as an administrator on contract for a government agency and one as a graduate student heading for a PhD in medical statistics. His present income of $8,500 per month from his contracts leaves him with an average of $5,519 after tax. Dennis focuses on his future: He does not expect to have kids, wants to earn his PhD and...