Virtually all of the discussions on how to reduce gas consumption and traffic congestion involves increasing the supply: Pump more oil, refine more gasoline, build more roads, more busses, new transit systems. Yes, we need to do those things and more; but, we can make faster, highly effective gains with very little cost through a relatively painless adjustment in our livestyles. Let's institutionalize the 4-day work week. Here's what it can do: *Reduce commuting traffic by as...