Homeless people

If you're a homeless person, scrounging around and wondering where your next meal is coming from, one of your priorities is getting money, ostensibly to pay for meals. 

I see homeless people on the corner, usually at the entrance or exit of a freeway, with a sign describing their downtroddenness and hangdog look used to garner donations from well-to-do people driving late-model vehicles. The problem is that nowadays, many people don't carry cash or coins. I've seen people roll down their windows, a sign beckoning the homeless person who approaches the vehicle eagerly, only to say they wish they could help, but they don't have any cash. I suppose the homeless person could reasonably retort, "There's an ATM on the corner. Get some cash and come back!"

So the priority for a homeless person is to find people most likely to have cash and coins. Look no further than another homeless person. If it's late afternoon, and some homeless person has been on that corner all day, there's a high likelihood that he or she will have cash and coins. It is a far higher probability that he or she will have cashola than the population writ large.