Over at least 30 years, supermarkets in developed economies around the world have acquired an increasing share of grocery markets. In doing so, they have increased their influence over suppliers—what food is grown and how it is processed and packaged—with impacts reaching deep into the lives and livelihoods of farmers and workers worldwide.In addition to increasing their market share with consumers, consolidation of suppliers means that retailers can exercise significant market power. In some countries, this has led to allegations of abuse, unethical and illegal conduct.