You buy a "Tap" card and proceed down into the Hollywood/Western Metro station. And you can't help thinking that sardined New York commuters would swoon to have this much room as they go about their rounds about Manhattan. Yes, it's all quite tidy and comfortable as you take the Red Line downtown, emerging into the gentle light of early evening at Pershing Square. You walk down 5th street, a gentle serpentine through the homeless, or those that would appear to be homeless, lingering or drifting on the sidewalk. Like them, you gape briefly at the requisite film shoot taking place in an alley of the north side of the street. And then, across Main Street and into Skid Row - in Los Angeles, this is actually a legally defined area. Despite the city's decades-long attempts to clear the inhabitants of Skid Row like so much rubbish, a homeless population in the thousands persists. But where sanitizing government has failed, economics might ...