June saw the release of the BrandZ Top 100 Most Valuable Global Brands of 2019, with Amazon taking the top spot for the first time. But why does it matter? How does it work? And what makes the difference between a top performing brand and those that drop off the list? Doreen Wang, global head of BrandZ for Kantar, tells Jane Bloomfield about the key themes, provides insights for growth and offers up some interesting case studies from this year’s global ranking.