Don’t underestimate the degree to which a business plan can enhance traffic, sales, and profitsYou’ve heard the old chestnut that compares failing to plan with planning to fail? Well, it’s truer than most people think. And many experts say jewelers are especially guilty because they tend to avoid one tool that could guide their management decisions and grow their bottom line: a business plan.Cindy Edelstein, president of Pelham, N.Y.–based Jeweler’s Resource Bureau, says most of what stops owners from developing a business plan is fear—fear that they won’t have time to tackle the project, or fear that they won’t know the answers to the questions that need attention, even if they’ve been in business for years.But consultants as well as retailers who have taken the plunge and developed a business plan say putting together a written document that assesses their company’s