A shared mailer is one postcard that several local businesses split. Each business buys a spot on it. We print the card once and USPS takes it to every home on the carrier routes it covers. The businesses share the printing and postage bill, so a spot costs a fraction of mailing a card alone.
It also goes by co-op mailer, shared postcard and shared direct mail. Some co-op mailers are envelopes full of coupons. Ours is one postcard, 11.00 by 8.50 inches, with every ad printed on it, so there is nothing to fall out.
Each trade gets one spot per card. A plumber, a dentist and a realtor can share a card. Two plumbers can't.