"…easier to authoritatively tell people what time it is, with a one-hour jump twice a year,…" Exactly. Also, changing business hours to suit specific work cond

"…easier to authoritatively tell people what time it is, with a one-hour jump twice a year,…" Exactly. Also, changing business hours to suit specific work conditions would ease traffic congestion. For instance, a farmer would milk cows at different times of the year. Similarly, milk tankers would be on the road at hours set by cows' routines.