"All we would do is tell the management that 'if you don't comply with health standards, we would boycott your supermarket until you do'. The supermarket would lose hundreds of thousands of pula and would be forced to change its practices to comply with the law," Wankie says.
He gives the example of consumer groups in the United Kingdom, which are so powerful that they can undertake campaigns to have unhealthy foods banned. Indeed consumers organised into a single unit can be a formidable voice.