NYT:

Yasmin Dawood, a professor of law and political science at the University of Toronto, said the timing of the elections appeared intended to enable the Conservatives, who overwhelmingly lead in fund-raising, to outspend opponents.

Election law changes introduced last year set a minimum of 37 days for campaigns but do not impose a maximum. The law means that parties would in theory be able to spend a maximum of about 25 million Canadian dollars, or $19.1 million, for the first 37 days of the election plus an extra 685,185 Canadian dollars for every day afterward. Fund-raising filings up until last month show that, barring a flood of funds for opposition parties, only the Conservatives would have the money to spend the maximum allowed.