in the numbers pulled out of our ass department.....
I'm not effective my first hour at work anyway. Its coffee and email time. Second the lighter day has a tendency to make me more apt to work longer - there's no accounting for that.
FWIW, these numbers are pulled out of an orifice that contains hundreds of millions of second-by-second attention data.... Not our asses.
Now, I'll concede that some of the other numbers (salaries of knowledge workers, numbers of knowledge workers, etc) are not toooo thoroughly researched, but they are in the neighborhood.
A commenter suggested that "we make it up on the other end" (with "fall back"), so we compared the fall DST to typical mondays and found that PEOPLE LOGGED BELOW AVERAGE TIME THERE AS WELL (which was a bit of a surprise). I'm assuming that people take the extra time they get if they wake up early to have a hearty breakfast or watch the news or somesuch.
points for the orifice comment, i liked that one ;-)
But a few more points
One the time isn't lost, as long as I've been working we've been changing our clocks. Its time already counted for in the natural cycle of business. Same as the lost productivity around 3 day weekends - and productivity gained by leap years.
Second if you can it would be interesting to compare productivity from the 3 weeks prior to the time change to the 3 week post the time change - I posited that I'd work more in the days after the time change due to the additional light at the end of day. I'd like to see if this is true.
I'm not effective my first hour at work anyway. Its coffee and email time. Second the lighter day has a tendency to make me more apt to work longer - there's no accounting for that.