Not necessarily.
Over the years, the structural elements that go into houses have changed with the codes. What we saw in the 1940s, 1950s and early 1960s were houses built with true two-by-fours, whereas the houses built in the 1980s and 1990s were nominal lumber, so they would be one and a half by three and a half instead of a true two-by-four. The older the wood, the stronger the wood. We're using cheaper lumber. The newer era is not necessarily less expensive to work on. I think that's maybe what you're getting at.
From an archetypal perspective—