How do people in big cities make extra cash, with so much competition?

Like in the country we just pick up cans for scrap, or have a yard sale. What do people in the big cities do to make some extra money. AND PLEASE REFRAIN FROM SAYING DRUGS

Public Comments

1. Your question is a spam magnet. Plan on most of the following answers to be scams.
2. deliver flyers, sell things (avon regal, ) take weekend jobs night guard, fast food restaurants , telemarketing, chores for busy / elderly ie shovelling snow racking leaves, craft classes for children after shcool gift wrapping , bake sales , yardsales, crafts then sell them at craft sales consignment shops, surveys, selling plants and herbs, dog walking, buying things a t yard sales selling them on ebay, house sitting delivering newspapers sewing hope that is helpful