Free money can be found anywhere people take their hands out of their pockets or purses. An errant quarter springs from the pocket while retrieving car keys. The rush to find exact change in a coin purse causes a few pennies to spill onto the floor.

Human beings, particularly those with steady employment, are incredibly lazy and the mere thought of reaching down for a dropped nickel is itself tiring. Your willingness to bend your back, extend your arms and pick up the abandoned change could become a mildly lucrative revenue stream.

Good places include under and around: