The act of boycotting brands is referred to as “political consumerism.” According to the political scientists Dietlind Stolle and Michele Micheletti, political consumerism refers to the use of the market as an arena for politics, in order to change institutional or market practices found to be ethically, environmentally or politically objectionable.
Political consumerism can also be about people deliberately purchasing brands to reward them. This is referred to as “buycotting”. For example...