Question about Tiers for events
Prior to 1988 there were no such things as tier one, tier two (and so on) tournaments, let alone premier mandatorys, premier5's, etc. But how did that work when it came to giving WTA ranking points? Was every title (apart from the majors) worth an equal amount of points, which would be kinda bizarre, or was there a certain ranking order among tournaments that meant that you could earn more points if you did well in the, say, Canadian Open as opposed to a tournament that today would be 'only' an international? If so, which were those tournaments that were tier ones in anything but name in the 1970's and 80's?