"DST means that people who work a standard day shift (and kids who go to school during the day) get more daylight after work. Manufacturers like this because we tend to engage in leisure activities, take short trips, and buy things after work — but not before — so a longer DST slightly increases sales.
For the same reason, a year-round DST would also be nice for anyone who works inside and simply likes to occasionally see the sun during the short days of winter. It'd mean getting up when it's a bit darker out in exchange for an extra hour of light after work. In Washington, DC, for instance, sunsets in the dead of winter would be at roughly 6 pm, instead of 5, and sunrises would be at 8:30 am, instead of 7:30."