This document discusses strategies for companies to expand the total market and defend their market share. It outlines two methods to expand the market: 1) attract new customers through market penetration, new market segments, and geographical expansion, and 2) create more usage by finding new ways to use the brand and bringing innovation to products. It also discusses two methods to defend market share: 1) proactive marketing requiring innovation, risk-taking, and future investment and 2) defensive marketing such as avoiding losing customers, differentiating the business, promoting products, and knowing the audience.