Our culture and economy is increasingly shifting away from a focus on a relatively small number of "hits" (mainstream products and markets) at the head of the demand curve and toward a huge number of niches in the tail (The theory of the Long Tail). Also, we are seeing a greater use of free and paid which is emerging as one of the most powerful digital business models. In the twenty-first century, Free is more than just a promotional gimmick: It's a business strategy that is essential to a company's successful future (Known as "Freemium"). Explain how a professional services firm like accountants, architects and lawyers will have to change to take advantage of both these emerging trends.