Next time you need a plumber—or an electrician or a tile installer— don’t ask a friend for a recommendation or look in the Yellow Pages. Instead, ask a wholesaler, the place where the pros shop. Ask a plumbing supply dealer (not the plumbing desk at a big box home center) for the names of two or three plumbers. Ask the electrical supplier for electricians. It’s in the interest of the wholesaler to give you the names of skilled, reliable contractors, who spend money at their stores and are reliable and pay their bills.