Mary Pollard has led on purpose at corporate communications consultancy Portland since the start of 2019. She joins Maja Pawinska Sims in the Echo Chamber to talk about the agency's first Total Value Index, which shows the true value of a business when purpose and profit are evaluated together, including the 'opportunity gap' – where companies are not telling their purposeful stories clearly enough – and the 'halo effect', when individual businesses benefit from positive perceptions of their whole sector.