A loss leader, or simply a leader, is a product sold at a low price (at cost or below cost) to stimulate other profitable sales. It is a kind of sales promotion, in other words marketing concentrating on a pricing strategy. A loss leader is often a popular article. Sometimes leader is now used as a related term and means any popular article, in other words one sold at a normal price.

One use of a loss leader is to draw customers into a store where they are likely to buy other goods. The vendor expects that the typical customer will purchase other items at the same time as the loss leader and that the profit made on these items will be such that an overall profit is generated for the vendor.

Loss Lead describes the concept that an item is offered for sale at a reduced price and is intended to lead to the subsequent sale of other items, the sales of which will be made in greater numbers, or greater profits, or both. It is offered at a price below its minimum profit margin—not necessarily below cost. The firm tries to maintain a current analysis of its accounts for both the loss lead and the associated items, so it can monitor how well the scheme is doing, as quickly as possible, thereby never suffering an overall net loss.

Bridge and tunnel (often abbreviated B&T or BNT) is a pejorative term for people who travel to Manhattan Island from surrounding communities, a commute that requires passing over a bridge and/or through a tunnel.

Though the name originates from the Triborough Bridge and Tunnel Authority, which services the five boroughs that make up New York City, the term has come to encompass all people who originate from outside of Manhattan, including the four other boroughs as well as Westchester County, Long Island, Connecticut and New Jersey.

The earliest known instance of this phrase in print is the December 13, 1977, edition of the New York Times:

"Bridge and tunnel" was later adopted in San Francisco in reference to party-goers who live outside San Francisco, as an ironic reference to this original usage, although the term is not always derogatory. Residents of the Peninsula and South Bay take commuter trains (Caltrain or BART, each of which has several tunnels) and freeways (I-280 and US 101, which do not) to visit city hot-spots but do not actually live in San Francisco (cf. a resident of Yonkers out in Manhattan). Residents from the East Bay typically drive or take a bus across the Bay Bridge (and Yerba Buena Tunnel) to reach San Francisco, or take BART through the Transbay Tube. The commute into San Francisco from Marin County also involves a bridge (the Golden Gate) and tunnel (Waldo).