Your point is valid, but this may be a bad example. Construction margins are so thin, and construction businesses so sensitive to it, and Lowe's and Home Depot

Your point is valid, but this may be a bad example. Construction margins are so thin, and construction businesses so sensitive to it, and Lowe's and Home Depot are so fungible. Even among retailers, there's no room for margin. Especially on easily-compared items like tools; construction workers know what they're buying.