That's right. The Quebec selection grid is quite similar to the one used by the federal government. It is based on human capital. To follow up on Ms. Atkinson's answer earlier, because of the economic conditions that prevailed at the time, there was a greater need for professional workers than for tradespeople.
As with any immigration system, conditions change and mechanisms and measures must change as well. Over the years, adjustments were made accordingly. Quebec in fact adjusted its selection grid several years ago for this very reason.